- Math, Grade 7
- Constructions and Angles
- Exploring Polygons

## Instructor Overview

# Lesson Overview

Students explore different polygons by drawing them, measuring angles, and manipulating interactive sketches to find the angle sum for any polygon. Students also explore the angle measures in regular polygons.

# Key Concepts

- The angle sum in a triangle is 180°. A quadrilateral can be composed of two triangles, so the angle sum of a quadrilateral is 360°.
- The number of triangles that compose a polygon is two less than the number of sides (angles). The sum of the interior angles in a polygon with
*n*sides is 180° (*n*– 2).

# Goals and Learning Objectives

- Find angle sums in polygons.
- Generalize to find the angle sum for any polygon.
- Find interior angle measures for regular polygons.

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