Question 1113623
Unclear but A+B+60 would be measure of angle C.
A and B were given to be congruent.
Let {{{x=A=B}}}.


{{{C+A+B=180}}}
{{{x+x+(2x+60)=180}}}
{{{4x=180-60}}}
{{{4x=120}}}
{{{x=30}}}


Angle A and B each is 30 degrees
and angle C is 120 degrees.