Illustrative Math Alignment: Grade 7 Unit 7

Topic

Triangles

Description

This example presents a triangle with side lengths of 10, 10, and 8. Since two sides are congruent, the triangle is classified as isosceles.

Triangle classification can be determined by side lengths or angle measures. Isosceles triangles have two equal sides or angles. Reviewing different examples assists students in identifying these types based on side or angle properties.

Seeing multiple worked-out examples reinforces students’ ability to classify triangles by consistently applying classification rules.

Topic

Triangles

Description

This example shows a triangle with two sides labeled as x and a third side labeled y. Because two sides are congruent, the triangle is classified as isosceles.

Triangles can be classified by their side lengths or angle measures. An isosceles triangle has two equal sides or angles, as seen in this example. Reviewing a series of examples helps students understand these classifications and recognize patterns in triangles.

Topic

Triangles

Description

This example shows a triangle with side lengths all equal to 9. Since all sides are congruent, the triangle is classified as equilateral.

Triangles can be classified based on side or angle properties. An equilateral triangle has all sides and angles congruent. Viewing multiple examples reinforces students’ understanding of these classifications and enhances their ability to recognize triangle properties.

Seeing several worked-out examples helps students understand and apply the rules consistently for classifying triangles.

Topic

Triangles

Description

This example shows a triangle with three sides labeled as x, all equal in length. Since all sides are congruent, the triangle is classified as equilateral.

Triangles can be categorized by side length or angle measures. An equilateral triangle has all congruent sides and angles. Reviewing multiple examples helps students recognize triangle classifications by observing side and angle patterns.

Providing several examples reinforces students’ ability to consistently classify triangles based on the observed properties.

Topic

Triangles

Description

This example shows a triangle with three angles, each measuring 60°. Since all angles are equal, the triangle is classified as equilateral.

Triangle classification can be based on side lengths or angle measures. An equilateral triangle has all angles congruent. Reviewing examples like these helps students understand classification rules based on triangle properties.

Multiple examples reinforce students' ability to identify triangle types consistently by observing angle or side characteristics.

Topic

Triangles

Description

This example presents a triangle with two angles labeled 60° and an unknown angle labeled x. Solving for x, we find it to be 60°, making all angles congruent and classifying the triangle as equilateral.

Triangle classification can be determined by side length or angle measures. An equilateral triangle has all equal sides and angles. Observing multiple examples helps students apply these criteria consistently when classifying triangles.

Seeing several worked examples helps students gain confidence in identifying triangles by recognizing congruent angles or sides.

Topic

Triangles

Description

This example presents a triangle with three sides labeled as x, each equal in length. Since all three sides are congruent, the triangle is classified as equilateral.

Triangles are categorized by their side lengths or angle measures. An equilateral triangle has all equal sides and angles, as seen in this example. Reviewing multiple examples reinforces students' understanding of the consistent characteristics that define each triangle type.

Providing multiple worked-out examples helps students confidently apply classification rules to identify triangles by their properties.

Topic

Triangles

Description

This example shows a triangle with angles measuring 90°, 60°, and 30°. Since one angle is exactly 90°, the triangle is classified as a right triangle.

Triangle classification often considers angle measures, with right triangles defined by having one 90° angle. Observing multiple examples allows students to consistently apply this classification rule.

Reviewing various worked-out examples helps students solidify their understanding of identifying triangle types based on angle measurements.

Topic

Triangles

Description

This example shows a triangle with two angles labeled 50° and 40° and an unknown angle x. Solving for x, we find it to be 90°, which classifies this as a right triangle.

Triangles are classified by side lengths or angles, and a right triangle has a 90° angle. Examining examples like this helps students reinforce the criteria for identifying right triangles based on their angle properties.

Seeing multiple worked-out examples enables students to apply classification rules more effectively and confidently.

Topic

Triangles

Description

This example presents a triangle with two congruent angles of 45° and one right angle of 90°. Because it has a 90° angle, the triangle is classified as a right triangle, and the two equal angles make it an isosceles right triangle.

Triangle classification can involve side lengths or angles. A right triangle has a 90° angle, while isosceles triangles have two equal angles or sides. This example combines both classifications. Reviewing multiple examples helps students confidently apply the criteria to identify triangle types.

Topic

Triangles

Description

This image shows a triangle with sides measuring 7, 8, and 9. The triangle is classified as scalene because each side has a different length, meaning no two sides are congruent.

Triangles can be classified by examining their side lengths or angle measures. Scalene triangles, like the one shown, have no congruent sides, making them unique. This collection of examples helps students understand classification rules and visually identify different triangle types.

Topic

Triangles

Description

This example shows a triangle with two known angles of 45° and an unknown angle x. Solving for x, we find it to be 90°, classifying this as a right triangle with two congruent angles, making it an isosceles right triangle.

Triangle classification may be based on side lengths or angles. Right triangles have a 90° angle, while isosceles triangles have two equal sides or angles. Examples like this help students understand combined classifications.

Topic

Triangles

Description

This example shows a triangle with angles labeled as x, 2x, and 3x. Solving for x, we find that the angles are 30°, 60°, and 90°, classifying it as a right triangle.

Triangle classification can involve angle measures or side lengths. Right triangles have one 90° angle, as seen here. Reviewing various examples supports students in consistently applying these classification rules.

Observing multiple worked-out examples helps students gain confidence in identifying triangles based on the presence of specific angle measures.

Topic

Triangles

Description

This example shows a triangle with two equal angles labeled x and a third angle labeled 2x. Solving for x, we find the angles to be 45°, 45°, and 90°, classifying it as an isosceles right triangle.

Triangles are classified by their angle measures or side lengths. Right triangles have a 90° angle, and isosceles triangles have two congruent angles. Reviewing examples like this one helps students understand combined classifications.

Topic

Triangles

Description

This example shows a triangle with angles labeled x, 3x, and 5x. Solving for x, we find the angles to be 20°, 60°, and 100°, which classifies this triangle as obtuse because one of the angles is greater than 90°.

Triangles can be classified by angle measures, with obtuse triangles defined as having one angle greater than 90°. Observing examples like this aids students in understanding how angle measures determine classifications.

Providing multiple worked-out examples reinforces students' ability to consistently classify triangles based on angle properties.

Topic

Triangles

Description

This example shows a triangle with angles labeled as x, 0.25x, and 1.1x. Solving for x, we find that all angles are less than 90°, classifying the triangle as acute.

Triangles are classified by their angle measures or side lengths, with acute triangles having all angles less than 90°. Reviewing examples like this helps students reinforce the criteria for classifying triangles based on angle sizes.

Seeing multiple worked-out examples builds students' confidence in applying classification rules and identifying triangle types based on consistent properties.

Topic

Triangles

Description

This example shows a triangle with side lengths of 12, 18, and x, where x is not equal to 12 or 18. The triangle is classified as scalene because all three side lengths are different.

Triangles are categorized by side length or angle. Scalene triangles, with all sides unequal, demonstrate a key classification type. Multiple examples help students recognize classification patterns for triangles based on side length or angle measure.

Observing various worked-out examples reinforces consistent application of classification criteria, building student confidence in identifying triangle types.

Topic

Triangles

Description

This example displays a triangle with angles measuring 89°, 44°, and 47°. Since all angles are less than 90°, the triangle is classified as acute.

Triangle classification can be based on side length or angle measures. Acute triangles have all angles less than 90°, as shown in this example. Reviewing multiple examples in this way helps students visually distinguish triangle types by angle.

Providing varied worked-out examples solidifies students’ understanding of the criteria for each triangle type, enabling them to accurately identify triangles by their angle measures.

Topic

Triangles

Description

This example presents a triangle with angles of 48°, 50°, and an unknown angle x. Solving for x, we find that x = 82°, meaning all angles are less than 90°, classifying it as acute.

Triangles can be identified by their angles or side lengths. Acute triangles have all angles less than 90°, as seen here. Reviewing examples like this supports student understanding of angle-based classification.

Seeing multiple worked examples helps students recognize patterns and confidently classify triangles based on established criteria.

Topic

Triangles

Description

This example shows a triangle with angles of 36°, 100°, and 44°. Because one of the angles is greater than 90°, this triangle is classified as obtuse.

Triangles are classified by side lengths or angles. An obtuse triangle has one angle greater than 90°, as seen here. This collection of examples supports students in identifying and classifying triangles based on distinct angle measures.

Seeing multiple worked-out examples reinforces students' understanding of classification rules, making it easier to recognize triangle types based on angle or side length.

Topic

Triangles

Description

This example presents a triangle with two known angles, 20° and 50°, and an unknown angle x. Solving for x, we find it to be 110°. Since one angle is greater than 90°, the triangle is classified as obtuse.

Triangles can be classified by their angles, where obtuse triangles have one angle over 90°. Reviewing examples like this aids students in understanding classification based on angle measures.

Seeing multiple examples reinforces the rules and helps students apply classification consistently and accurately.

Topic

Triangles

Description

This example shows a triangle with two angles, each measuring 60°. Since two angles are congruent, this triangle is classified as isosceles.

Triangles can be categorized by side or angle properties. Isosceles triangles have two equal sides or two equal angles, as illustrated here. This collection of examples allows students to observe classifications and understand patterns in triangle properties.

Examining multiple examples helps students confidently identify triangle types based on consistent characteristics.

Topic

Triangles

Description

This example shows a triangle with two angles labeled x and one angle labeled y. Since two angles are congruent, the triangle is classified as isosceles.

Triangles can be classified by side lengths or angle measures. Isosceles triangles, with two equal sides or angles, are common. Observing various examples helps students understand these classification criteria.

Providing multiple examples allows students to identify patterns in side and angle relationships, reinforcing accurate triangle classification.

This set of tutorials provides 36 examples of how to classify polygons based on side and angle characteristics.

Related Resources

To see resources related to this topic click on the Related Resources tab above.

Properties of Polygons. In the ancient city of Marrakesh, polygons are on display. As part of the Islamic tile work prevalent throughout the Middle Ages, Marrakesh provides an opportunity to explore the properties of polygons, and how these properties are taken advantage of in the intricate designs found throughout this fascinating city. Note: The download for this resources is the Promethean Flipchart.

This video [VIDEO: Geometry Applications: Polygons, Segment 2: Properties of Polygons]  includes a video transcript: https://media4math.com/library/video-transcript-geometry-applications-polygons-segment-2-properties-polygons

The Petronas Towers in Indonesia provide an opportunity to explore the composite shapes used in the design of the towers. Note: The download for this resources is the Promethean Flipchart.

To access the full video: https://media4math.com/library/geometry-applications-polygons-segment-3-composite-figures

This video includes a Video Transcript: https://www.media4math.com/library/video-transcript-geometry-applications-polygons-segment-3-composite-figures

This is the transcript for the video entitled, Desmos Geometry Exploration: Polygons. In this video tutorial the polygons are explored. Students are then shown how to construct polygons using the Desmos geometry tools. The Desmos geometry tools can be found at www.desmos.com/geometry.

This is the transcript for the video entitled, Desmos Geometry Exploration: Regular Polygons 1. In this video tutorial regular polygons are explored. The focus of this video is on triangles and quadrilaterals. Students are then shown how to construct regular polygons using the Desmos geometry tools. The Desmos geometry tools can be found at www.desmos.com/geometry.

This is the transcript for the video entitled, Desmos Geometry Exploration: Regular Polygons 2. In this video tutorial regular polygons are explored. The focus of this video is on pentagons and hexagons. Students are then shown how to construct regular polygons using the Desmos geometry tools. The Desmos geometry tools can be found at www.desmos.com/geometry.

This is the transcript for the video of same title. Video contents: In this program we explore the properties of polygons. We do this in the context of two real-world applications. In the first, we look at Islamic tile patterns as examples of regular polygons. We explore how such intricate patterns were created using a compass and straight edge. In the second application we look at composite figures, specifically in the context of the design of the Petronas Towers in Indonesia.

This is the transcript for the video of same title. Video contents: The Pentagon is one of the most famous polygon-shaped buildings in the world. But why was this shape chosen over a more straightforward quadrilateral shape? We briefly explore the properties of pentagons and use this as a way of introducing the key concepts throughout the program.

This is the transcript for the video of same title. Video contents: In the ancient city of Marrakesh polygons are on display. As part of the Islamic tile work prevalent throughout the Middle Ages, Marrakesh provides an opportunity to explore the properties of polygons, and how these properties are taken advantage of in the intricate designs found throughout this fascinating city.

This is the transcript for the video of same title. Video contents: The Petronas Towers in Indonesia provide an opportunity to explore the composite shapes used in the design of the towers.

To see the complete collection of video transcriptsy, click on this link.

Topic

Geometry

Description

Polygons are closed figures with straight sides. Regular polygons have congruent sides and angles, while irregular polygons do not. Desmos tools allow creating polygons like triangles and quadrilaterals and measuring their angles and sides. Key terms include congruent, vertices, and interior angles. Applications focus on understanding polygon properties and calculations.

Topic

Geometry

Description

This tutorial delves into constructing regular triangles and squares using Desmos. Regular polygons have congruent sides and angles. Techniques involve using circles and perpendicular bisectors. Key terms include equilateral, perpendicular bisector, and congruent. Applications explore creating and verifying geometric properties in polygons.

Topic

Geometry

Description

The video covers regular pentagons and hexagons, emphasizing their congruent sides and angles. Viewers use Desmos to construct these polygons, leveraging tools like circles and angle bisectors. Key terms include regular polygons, angle bisector, and transformations. Applications demonstrate advanced constructions and polygon properties.

Topic

Polygons

Topic

Polygons

Description

This segment introduces polygons through the Pentagon's design. The building’s advantages include increased perimeter and accessibility due to its five-sided structure, illustrating how polygons solve real-world design challenges. Key concepts include perimeter, angles, and design versatility.

Relevance to Topic: This video explains and highlights various applications of polygons in real-life scenarios and mathematical contexts, providing valuable insights for understanding geometric concepts.

Topic

Polygons

Description

The segment explores Islamic art’s reliance on geometric patterns formed by regular polygons. It demonstrates how artisans used compasses and straightedges to create precise designs, highlighting properties like congruent sides and angles, and applications in tiling and architecture.

Relevance to Topic: This video explains and highlights various applications of polygons in real-life scenarios and mathematical contexts, providing valuable insights for understanding geometric concepts.

Topic

Polygons

Description

Composite figures in architecture, like the Petronas Towers, combine polygons to form complex shapes. This segment examines patterns like overlapping squares and calculates areas using properties of triangles and hexagons. Applications include architectural symmetry and efficiency.

Relevance to Topic: This video explains and highlights various applications of polygons in real-life scenarios and mathematical contexts, providing valuable insights for understanding geometric concepts.