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Illustrative Math-Media4Math Alignment

 

 

Illustrative Math Alignment: Grade 7 Unit 3

Measuring Circles

Lesson 3: Exploring Circumference

Use the following Media4Math resources with this Illustrative Math lesson.

Thumbnail Image Title Body Curriculum Nodes
Math Example--Area and Perimeter--Circular Area and Circumference: Example 2 Math Example--Area and Perimeter--Circular Area and Circumference: Example 2 Math Example--Area and Perimeter--Circular Area and Circumference: Example 2

Topic

Geometry

Description

This example features a circle with a radius of 5 units. The objective is to calculate the circumference of the circle using the given radius. The solution involves applying the circumference formula: C = 2 * π * r = 2 * π * (5) = 10π.

Circular area and circumference calculations are fundamental in geometry. These examples provide students with practical applications of theoretical concepts, helping them understand the relationship between a circle's radius and its circumference.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 3 Math Example--Area and Perimeter--Circular Area and Circumference: Example 3 Math Example--Area and Perimeter--Circular Area and Circumference: Example 3

Topic

Geometry

Description

This example introduces a circle with an unknown radius represented by x. The task is to express the area of the circle in terms of x. The solution demonstrates how to use the area formula with a variable radius: A = π * r2 = π * (x)2 = π * x2.

Working with variable expressions in geometry helps students transition from concrete to abstract thinking. This example bridges the gap between numerical calculations and algebraic representations, a crucial skill in advanced mathematics.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 4 Math Example--Area and Perimeter--Circular Area and Circumference: Example 4 Math Example--Area and Perimeter--Circular Area and Circumference: Example 4

Topic

Geometry

Description

This example presents a circle with an unknown radius represented by x. The task is to express the circumference of the circle in terms of x. The solution demonstrates how to use the circumference formula with a variable radius: C = 2 * π * r = 2 * π * x = 2πx.

Understanding circular area and circumference is crucial in geometry. This example helps students transition from concrete numerical values to abstract algebraic expressions, fostering a deeper comprehension of the relationship between a circle's radius and its circumference.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 5 Math Example--Area and Perimeter--Circular Area and Circumference: Example 5 Math Example--Area and Perimeter--Circular Area and Circumference: Example 5

Topic

Geometry

Description

This example features two concentric circles with radii of 5 and 4 units. The task is to calculate the area of the shaded region between these circles. The solution involves subtracting the area of the smaller circle from the area of the larger circle: A = π * (5)2 - π * (4)2 = 25π - 16π = 9π.

Concentric circles and shaded regions introduce students to more complex geometric concepts. This example builds upon basic circular area calculations, encouraging students to think about the relationships between different circles and how to find areas of composite shapes.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 6 Math Example--Area and Perimeter--Circular Area and Circumference: Example 6 Math Example--Area and Perimeter--Circular Area and Circumference: Example 6

Topic

Geometry

Description

This example presents two concentric circles with radii of 5 and y units. The objective is to express the area of the shaded region between these circles in terms of y. The solution involves subtracting the area of the smaller circle from the area of the larger circle: A = π * (5)2 - π * y2 = 25π - πy2 = π(25 - y2).

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 7 Math Example--Area and Perimeter--Circular Area and Circumference: Example 7 Math Example--Area and Perimeter--Circular Area and Circumference: Example 7

Topic

Geometry

Description

This example features two concentric circles with radii x and y. The task is to express the area of the shaded region between these circles in terms of x and y. The solution involves subtracting the area of the smaller circle from the area of the larger circle: A = π * x2 - π * y2 = π(x2 - y2).

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 8 Math Example--Area and Perimeter--Circular Area and Circumference: Example 8 Math Example--Area and Perimeter--Circular Area and Circumference: Example 8

Topic

Geometry

Description

This example presents a circle with a radius of 5 units and a shaded sector with a central angle of 30 degrees. The task is to calculate the area of the shaded sector. The solution involves using the central angle to find the fractional amount of the total area: A = (30 / 360) * π * 52 = 25π / 12.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 9 Math Example--Area and Perimeter--Circular Area and Circumference: Example 9 Math Example--Area and Perimeter--Circular Area and Circumference: Example 9

Topic

Geometry

Description

This example features a circle with a radius of 5 units and a shaded arc corresponding to a central angle of 30 degrees. The task is to calculate the length of the shaded arc. The solution involves using the central angle to find the fractional amount of the circumference: Arc Length = (30 / 360) * 2 * π * 5 = 5π / 6.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 10 Math Example--Area and Perimeter--Circular Area and Circumference: Example 10 Math Example--Area and Perimeter--Circular Area and Circumference: Example 10

Topic

Geometry

Description

This example presents a circle with radius x and a shaded sector with central angle θ (theta). The task is to express the area of the shaded sector in terms of x and θ. The solution involves using the central angle to find the fractional amount of the total area: A = (θ / 360) * π * x2 = πx2θ / 360.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 11 Math Example--Area and Perimeter--Circular Area and Circumference: Example 11 Math Example--Area and Perimeter--Circular Area and Circumference: Example 11

Topic

Geometry

Description

This example presents a circle with radius x and a shaded sector with central angle θ (theta). The task is to express the arc length of the shaded region in terms of x and θ. The solution involves using the central angle to find the fractional amount of the circumference: Arc Length = (θ / 360) * (2 * π * x) = (θ * x / 180) * π.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 12 Math Example--Area and Perimeter--Circular Area and Circumference: Example 12 Math Example--Area and Perimeter--Circular Area and Circumference: Example 12

Topic

Geometry

Description

This example features a circle with a radius of 5 units and a shaded sector with central angle θ (theta). The task is to express the area of the shaded sector in terms of θ. The solution involves using the central angle to find the fractional amount of the total area: Area = (θ / 360) * (π * 52) = 25π / 360 * θ = 5π / 72 * θ.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 13 Math Example--Area and Perimeter--Circular Area and Circumference: Example 13 Math Example--Area and Perimeter--Circular Area and Circumference: Example 13

Topic

Geometry

Description

This example presents a circle with a radius of 5 units and a shaded sector with central angle θ (theta). The task is to express the arc length of the shaded region in terms of θ. The solution involves using the central angle to find the fractional amount of the circumference: Arc Length = (θ / 360) * (2 * π * 5) = θ / 18 * π.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 14 Math Example--Area and Perimeter--Circular Area and Circumference: Example 14 Math Example--Area and Perimeter--Circular Area and Circumference: Example 14

Topic

Geometry

Description

This example features a circle with radius x and a shaded sector with a central angle of 30 degrees. The task is to express the area of the shaded sector in terms of x. The solution involves using the central angle to find the fractional amount of the total area: Area = (30 / 360) * (π * x2) = π * x2 / 12.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 15 Math Example--Area and Perimeter--Circular Area and Circumference: Example 15 Math Example--Area and Perimeter--Circular Area and Circumference: Example 15

Topic

Geometry

Description

This example presents a circle with radius x and a shaded sector with a central angle of 30 degrees. The task is to express the arc length of the shaded region in terms of x. The solution involves using the central angle to find the fractional amount of the circumference: Arc Length = (30 / 360) * (2 * π * x) = x / 6 * π.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 16 Math Example--Area and Perimeter--Circular Area and Circumference: Example 16 Math Example--Area and Perimeter--Circular Area and Circumference: Example 16

Topic

Geometry

Description

This example features two concentric circles with radii of 5 and 4 units, and a shaded sector with a central angle of 30 degrees. The task is to calculate the area of the shaded region. The solution involves using the central angle to determine the fractional area difference between the larger and smaller circles: Area = (θ / 360) * (π * r12 - π * r22) = (30 / 360) * (π * 52 - π * 42) = π / 12 * (25 - 16) = 3π / 4.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 17 Math Example--Area and Perimeter--Circular Area and Circumference: Example 17 Math Example--Area and Perimeter--Circular Area and Circumference: Example 17

Topic

Geometry

Description

This example presents two concentric circles with radii of 5 and 4 units, and a shaded sector with a central angle of 30 degrees. The task is to calculate the perimeter of the shaded region. The solution involves calculating arc lengths based on the central angle and adding straight-line segments between radii: Perimeter = (θ / 360) * (2 * π * r1 + 2 * π * r2) + 2 * (r1 - r2) = (30 / 360) * (2π * 5 + 2π * 4) + 2 * (5 - 4) = 3π / 2 + 2.

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 18 Math Example--Area and Perimeter--Circular Area and Circumference: Example 18 Math Example--Area and Perimeter--Circular Area and Circumference: Example 18

Topic

Geometry

Description

This example features two concentric circles with radii x and y, and a shaded sector with a central angle θ (theta). The task is to express the area of the shaded region in terms of x, y, and θ. The solution uses the central angle to find the fractional area difference between the larger and smaller circles: Area = (θ / 360) * (π * x2 - π * y2) = (θπ / 360) * (x2 - y2).

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 19 Math Example--Area and Perimeter--Circular Area and Circumference: Example 19 Math Example--Area and Perimeter--Circular Area and Circumference: Example 19

Topic

Geometry

Description

This example presents two concentric circles with radii x and y, and a shaded sector with a central angle θ (theta). The task is to express the perimeter of the shaded region in terms of x, y, and θ. The solution involves calculating arc lengths based on the central angle and adding straight-line segments between radii: Perimeter = (θ / 360) * (2πx + 2πy) + 2(x - y) = π/180 * θ(x + y) + 2(x - y).

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 20 Math Example--Area and Perimeter--Circular Area and Circumference: Example 20 Math Example--Area and Perimeter--Circular Area and Circumference: Example 20

Topic

Geometry

Description

This example features two concentric circles with radii 5 and y, and a shaded sector with a central angle of 30 degrees. The task is to express the area of the shaded region in terms of y. The solution involves calculating the difference between the areas of the larger and smaller circles, accounting for the central angle: Area = π/12 * (25 - y2).

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 21 Math Example--Area and Perimeter--Circular Area and Circumference: Example 21 Math Example--Area and Perimeter--Circular Area and Circumference: Example 21

Topic

Geometry

Description

This example features two concentric circles with radii 5 and y, and a shaded sector with a central angle of 30 degrees. The task is to calculate the perimeter of the shaded region. Given a central angle of 30 degrees, radius 5, and unknown radius y, the perimeter is calculated as: Perimeter = π/6 * (5 + y) + 2(5 - y).

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 22 Math Example--Area and Perimeter--Circular Area and Circumference: Example 22 Math Example--Area and Perimeter--Circular Area and Circumference: Example 22

Topic

Geometry

Description

This example presents two concentric circles with radii 4 and x, and a shaded sector with a central angle θ (theta). The task is to express the area of the shaded region in terms of x and θ. The solution uses the central angle to find the fractional area difference between the larger and smaller circles: Area = (θ / 360) * (π * x2 - π * 42) = (θ * π / 360) * (x2 - 16).

Area and Circumference
Math Example--Area and Perimeter--Circular Area and Circumference: Example 23 Math Example--Area and Perimeter--Circular Area and Circumference: Example 23 Math Example--Area and Perimeter--Circular Area and Circumference: Example 23

Topic

Geometry

Description

This example features two concentric circles with radii x and 4, and a shaded sector with a central angle θ (theta). The task is to express the perimeter of the shaded region in terms of x and θ. The solution involves calculating arc lengths based on the central angle and adding straight-line segments between radii: Perimeter = (θ / 360) * (2 * π * x + 2 * π * 4) + 2 * (x - 4) = (π / 180) * θ(x + 4) + 2(x - 4).

Area and Circumference
MATH EXAMPLES--Teacher's Guide: Circular Area and Circumference MATH EXAMPLES--Teacher's Guide: Circular Area and Circumference MATH EXAMPLES--Teacher's Guide: Circular Area and Circumference

This set of tutorials provides 23 examples of solving for the area and circumferences of circles and sections of circles.

This is part of a collection of teacher's guides. To see the complete collection of teacher's guides, click on this link. Note: The download is a PDF file.

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Area and Circumference
WorksheetThumbnail.jpg Worksheet: Crossword Puzzle--Circles Worksheet: Crossword Puzzle--Circles

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Definition of a Circle
WorksheetThumbnail.jpg Worksheet: Crossword Puzzle--Circles Worksheet: Crossword Puzzle--Circles

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Definition of a Circle
WorksheetThumbnail.jpg Worksheet: Crossword Puzzle--Circles Worksheet: Crossword Puzzle--Circles

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Definition of a Circle
WorksheetThumbnail.jpg Worksheet: Crossword Puzzle--Circles Worksheet: Crossword Puzzle--Circles

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Definition of a Circle
WorksheetThumbnail.jpg Worksheet: Crossword Puzzle--Circles Worksheet: Crossword Puzzle--Circles

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Definition of a Circle
WorksheetThumbnail.jpg Worksheet: Crossword Puzzle--Circles Worksheet: Crossword Puzzle--Circles

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Definition of a Circle
WorksheetThumbnail.jpg Worksheet: Crossword Puzzle--Circles Worksheet: Crossword Puzzle--Circles

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Worksheet: 2D Shapes Worksheet: 2D Shapes, Worksheet 1 Worksheet: 2D Shapes, Worksheet 1

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WorksheetThumbnail.jpg Worksheet: Analyzing Shapes, Worksheet 1 Worksheet: Analyzing Shapes, Worksheet 1

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WorksheetThumbnail.jpg Worksheet: Analyzing Shapes, Worksheet 3 Worksheet: Analyzing Shapes, Worksheet 3

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 1 Worksheet: Identifying Shapes, Worksheet 1

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Definition of a Circle, Definition of a Polygon and Definition of a Triangle
WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 1 Worksheet: Identifying Shapes, Worksheet 1

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Definition of a Circle, Definition of a Polygon and Definition of a Triangle
WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 1 Worksheet: Identifying Shapes, Worksheet 1

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Definition of a Circle, Definition of a Polygon and Definition of a Triangle
WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 1 Worksheet: Identifying Shapes, Worksheet 1

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 2 Worksheet: Identifying Shapes, Worksheet 2

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 2 Worksheet: Identifying Shapes, Worksheet 2

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 2 Worksheet: Identifying Shapes, Worksheet 2

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 2 Worksheet: Identifying Shapes, Worksheet 2

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 3 Worksheet: Identifying Shapes, Worksheet 3

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 3 Worksheet: Identifying Shapes, Worksheet 3

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 3 Worksheet: Identifying Shapes, Worksheet 3

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 3 Worksheet: Identifying Shapes, Worksheet 3

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 4 Worksheet: Identifying Shapes, Worksheet 4

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WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 4 Worksheet: Identifying Shapes, Worksheet 4

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Definition of a Circle, Definition of a Polygon and Definition of a Triangle
WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 4 Worksheet: Identifying Shapes, Worksheet 4

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Definition of a Circle, Definition of a Polygon and Definition of a Triangle
WorksheetThumbnail.jpg Worksheet: Identifying Shapes, Worksheet 4 Worksheet: Identifying Shapes, Worksheet 4

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Definition of a Circle, Definition of a Polygon and Definition of a Triangle
Math Clip Art--Geometry Concepts--Kite Shape 1 Math Clip Art--Geometry Concepts--Kite Shape 1 Math Clip Art--Kite Shape 1

Topic

Geometry Concepts

Description

This image features a kite shape, in this case a circular one. Ordinarily a kite is a quadrilateral with two pairs of adjacent equal-length sides. The diagonals intersect at right angles, and one diagonal bisects the other, creating a symmetrical shape.

Kite shapes are important in geometry for understanding properties like symmetry, area, and perimeter. They are used in various mathematical applications, including tiling and design.

Teacher's Script: "Examine this kite. What makes it a kite in the everyday understanding of it? Is it a kite in geometric terms?"

Definition of a Circle, Definition of a Polygon and Definition of a Triangle