Question

Two angles of a triangle are ${65}^{\circ }$ and ${45}^{\circ }$, then the third angle (in degrees) is ______ .

• A. 70

Answer 1

The correct option is A 70
Let the third angle be 'x'
From angle sum property of a triangle, we have
${65}^{\circ }+{45}^{\circ }+x^{\circ }={180}^{\circ }\Rightarrow x={180}^{\circ }-{110}^{\circ }\Rightarrow x={70}^{\circ }$