One angle of a triangle measures 126°. the other two angles are congruent. Enter and solve an equation to find the measure x of the congruent angles.

An equation is (blank) = 180

The congruent angles each measure (blank) °

Fill in the blanks.

First we name the angles if the triangle a, b, c respectively. So the first answer is

a + b + c = 180

since we know 1 angle of the triangle (we can call it a), we can subtract 'a' which is 126 from 180 degrees, which will become the sum of the congruent angles.