Lesson: Interior Angles of a Polygon Mathematics • Second Year of Preparatory School

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In this lesson, we will learn how to find the sum of the measures of the interior angles of a polygon given the number of its sides and the measure of an angle in a regular polygon.

Lesson Plan

Students will be able to

identify and classify polygons as concave or convex,
divide a polygon into triangles in order to find the sum of its interior angles,
find the sum of the interior angles of a polygon given its number of sides using the formula,
find the measure of the interior angle of a regular polygon given its number of sides using the formula,
find the measure of an angle in an irregular polygon given its number of sides and the measure of the other angles in the polygon,
understand the relationship between interior and exterior angles and their sums in a polygon,
find the measure of an exterior angle of a regular polygon given its number of sides,
find the number of sides a regular polygon has given the measure of one of its interior angles.