Math Example--Area and Perimeter--Triangles: Example 25

Topic

Geometry

Description

This example focuses on calculating the perimeter of an obtuse triangle with specific side lengths. The triangle has sides measuring 15, 6, and 18 units, with an obtuse angle of 120 degrees. Students are guided through the process of adding these side lengths to find the perimeter.

Understanding perimeter calculations for various triangle types, including obtuse triangles, is a fundamental concept in geometry. This collection of examples helps teach this topic by illustrating how to calculate perimeter for obtuse triangles with given dimensions. Students learn to apply the perimeter formula consistently, regardless of the triangle's specific angles.

Providing multiple worked-out examples is crucial for students to fully comprehend the concept of triangle perimeter. Each example reinforces the basic principle while introducing different triangle types. This approach helps students recognize that perimeter calculation remains consistent regardless of whether the triangle is acute, right, or obtuse.

Teacher Script: "Let's examine this obtuse triangle. We're given the lengths of all three sides, as well as an angle measurement of 120 degrees. For perimeter, which of these pieces of information do we need? That's right, just the side lengths. Can someone walk us through the calculation of the perimeter? How does this compare to our previous examples with acute triangles?"

For a complete collection of math examples related to Area and Perimeter click on this link: Math Examples: Triangular Area and Perimeter Collection.