Exterior angle 180-144 Therefore the exterior angle is 36 The formula to find the number of sides of a regular polygon is as follows. If we imagine the polygon as a house the in terior angles live in side of the house while the ex terior angles live in ex ile outside of the house. Sum Of Polygon Angles In 2022 Math Formulas Interior And Exterior Angles Exterior Angles Tracing around a convex n-gon the angle turned at a corner is the exterior or external angle. . Each exterior angle frac 360. Exterior angle The exterior angle is the supplementary angle to the interior angle. 1 2 3 4 5 a b c d e 360º Sum of the angles at a point is 360º 4 x 90º 4 right angles. A rectangle and a rhombus are examples of an irregular polygon. By the time you get back to where you started you have. When we add up the Interior Angle and Exterior Angle we get a straight. θ 180n 2 n or θ 180n 360 n To find the size of each exterior...