Sum Of Interior And Exterior Angles Of A Regular Polygon. The sum of an interior angle and its corresponding exterior angle is always 180 degrees since they lie on the same straight line. Multiply the number of triangles formed with 180 to determine the sum of the interior angles.
Triangles There are 3 sides and a sum of 180 degrees. The goal of the Polygon Interior Angle Sum Conjecture activity is for students to conjecture about the interior angle sum of any n-gon. Still this is an easy idea to remember.
9 rows The sum of an adjacent interior angle and exterior angle for any polygon is equal to 180.
180 Regular and Irregular Polygons. By considering angle sums work out interior and exterior angles of polygons. 3-sided polygon is a triangle and the sum. Phillip Mangiaracina April 2008 Open content licensed under CC BY-NC-SA.