Question

One angle of a quadrilateral is 180 degree and the three remaining three angles are equal. Find the three equal angles .

Answer 1

As we know that,
a + b + c + d =360
a = 180
given,
b = c= d 
so, a + 3b =360
180 + 3b =360
3b = 360-180
3b = 180
b = 60
hence we know that,
b = c = d
so, c = 60
d = 60

HOPE IT HELPS!