Question

The three angles of a quadrilateral are ${75}^{\circ }$, ${90}^{\circ }$ and ${75}^{\circ }$. The fourth angle is:

• A. 90°
• B. 95°
• C. 105°
• D. 120°

Answer 1

The correct option is D

120°

The sum of all angles of a quadrilateral is ${360}^{\circ }$.

Fourth angle = ${360}^{\circ }$-(${75}^{\circ }$+${90}^{\circ }$+${75}^{\circ }$)

=${120}^{\circ }$