Question

In a ∆ABC, if ∠A = 72° and ∠B = 63°, find ∠C.

Answer 1

Sum of the angles of a triangle is 180°.

$$\begin{gathered} \therefore \angle A+\angle B+\angle C=180° \\ 72°+63°+\angle C=180° \\ \angle C=45° \end{gathered}$$

Hence, ∠C measures 45°.