Find The Measure Of Each Exterior Angle Of A Equilateral Triangle. It can be proven geometrically since each exterior angle. An equiangular triangle has angles that are all congruent.
Find the measure of the angle indicated. Divided by the number of sides. Step 2 Substitute 75 for x in 2x 5 to fi nd mJKM.
Interior Angles Solve for x.
2x 5 2 75 5 145 So the measure of JKM is 145. The exterior angles of an equilateral triangle will always have a measure of 120. As the triangle is equiangular all the angles of the triangle are equal. We know that for an equilateral triangle AB BC CA and ABC BCA CAB180360 1 Now Extend side BC to D CA to E and AB to F.