Find The Sum Of The Measures Of Exterior Angles Of A Regular Triangle. The sum of the exterior angles one at each vertex of a regular polygon add to 360 Therefore the sum of each is the same. We know that the angles of a triangle will always add up to 180.
The sum of exterior angle and interior angle is equal to 180 degrees. The sum of the exterior angles one at each vertex of a regular polygon add to 360 Therefore the sum of each is the same. If a polygon is convex then the sum of the measures of the exterior angles one at each vertex is 360.
Therefore all its exterior angles measure the same as well that is 120 degrees.
An exterior angle of a triangle is equal to the sum of the opposite interior angles. The sum of the measures of the exterior angles of a polygon one at each vertex is 360. The answer is D. The exterior angles taken one at each vertex always sum up to 360.