Question

one angle of a triangle measures 120 degrees. the other two angles are congruent. write and solve an equation to find the measure of congruent angeles

Answer 1

the three angles of a triangle always add to 180, do the 2 congruent angles must measure 180-120=60. this number must be divided in two since the angles are congruent, so 60/2=30. 120+30+30=@80, as needed. so the equation to find x, the size of the congruent angles, would be

x=(180-120)/2