Question

Mark (✓) against the correct answer
In ∆ABC, if ∠A = 65° and ∠C = 85°, then ∠B = ?

(a) 25°
(b) 30°
(c) 35°
(d) 40°

Answer 1

$$\begin{gathered} \left(b\right)30° \\ \begin{array}{r}\angle \text{A+}\angle \text{B+}\angle \text{C}={180}^0\\ =>\angle \text{B}={180}^0-({65}^0+{85}^0)\\ =>\angle \text{B}={180}^0-{150}^0\\ =>\angle \text{B}={30}^0\\ \\ \end{array} \end{gathered}$$