Question

In triangle ABC, if A is 72°and B is 63° find twice the third angle.

Answer 1

45° is the third angle.

Answer 2

In Triangle ABC,
By Angle Sum Property.
<A+<B+<C = 180
72+63+<C = 180
<C=180-135
<C=45
So ,twice the third angle=2×45=90