Question

Find the measure of each exterior angle of and equilateral triangle.

Answer 1

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.

Answer 2

as in equilateral triangle each interior angles is 60 .therefore the measure of ext angles must be 120
(sum of two opp interior angle is equal to one exterior angle therefore 60 + 60 = 120)
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