Question

One of the interior opposite angles of a triangle to the exterior angle 120 deg is 70 deg, find other angle.

• A. 50

Answer 1

The correct option is A 50
In a triangle,
Exterior angle = Sum of two interior opposite angles.
Let the other interior opposite angle be $\text{X}$.
${120}^{\circ }={70}^{\circ }+{\text{X}}^{\circ }{120}^{\circ }-{70}^{\circ }={\text{X}}^{\circ }{\text{X}}^{\circ }={50}^{\circ }$