The measure of one angle of a triangle is 115°. the other two angles are congruent. what is the measure of each angle?
115°
65°
57.5°
32.5°

The sum of the angles of the triangle is equal to 180°.

Let x be the measure of the each of the two angles. The equation that would best represent and relate the given measures of the angle is,
 
                              180 = x + x + 115

Group all variables and constants in each side of the equation.

                        180 - 115 = 2x

Simplifying,

                         65 = 2x

Divide the equation by 2,
 
                      32.5 = x

The value of x is equal to 32.5°.

Hence, the answer is the last choice. 

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