# Exterior angles sum formula

Dec 20, 2017 · Angle Sum And Exterior Of Triangles Worksheet By Mr Slope Guy Justifying The Exterior Angle Of A Triangle Theorem Students Are Grade Math Transformational ...

Sep 20, 2015 · It will always be the case that the two non-connected angles will sum to equal the exterior angle of any type of triangle.) Now we again have two angles that create a straight line, which means that we can find the measure of angle CDA by subtracting our known angle from 180 °.

The formula for calculating the size of an interior angle is: interior angle of a polygon = sum of interior angles ÷ number of sides. The sum of exterior angles of a polygon is 360°. The formula for calculating the size of an exterior angle is: exterior angle of a polygon = 360 ÷ number of sides.

Sum of Interior angles Sum of Exterior Angles 3 1 4 5 6 Any polygon n GENERAL RULE: For a polygon with n sides, the sum of INTERIOR angles is given by the formula: For any polygon the sum of EXTERIOR angles is always _____. 2. a) Determine the sum of the interior angles in a polygon with 15 sides. Show your work. An exterior angle of a triangle is equal to the sum of the opposite interior angles. For more on this see Triangle external angle theorem . If the equivalent angle is taken at each vertex, the exterior angles always add to 360° In fact, this is true for any convex polygon, not just triangles.