Lesson: Interior Angles of a Polygon Mathematics • 8th Grade

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.