Question

Find the value of (x+y) from the figure below:

• A. 120${}^{\circ }$
• B. 60${}^{\circ }$
• C. 80${}^{\circ }$
• D. 45${}^{\circ }$

Answer 1

The correct option is A

120${}^{\circ }$

The value of exterior angle of a triangle is equal to the sum of the opposite interior angles.

As the exterior angle value is given to be 120${}^{\circ }$, the sum of the two opposite interior angles is also 120${}^{\circ }$.
Thus, (x+y) = 120${}^{\circ }$