Question

Two angles of a triangle are ${50}^{\circ }$​ and ${70}^{\circ }$​. The third angle is:

• A. 50^o
• B. 70^o
• C. 60^o
• D. 120^o

Answer 1

The correct option is C

60^o

The sum of all the angles of a triangle is ${180}^{\circ }$​.

Therefore,
$\text{Third angle}={180}^{\circ }-({50}^{\circ }+{70}^{\circ })={180}^{\circ }-\left({120}^{\circ }\right)={60}^{\circ }$​