Question

The three angles of a quadrilateral are ${40}^{\circ },{80}^{\circ },{90}^{\circ }$. The fourth angle is.

• A. ${150}^{\circ }$
• B. ${140}^{\circ }$
• C. ${180}^{\circ }$

Answer 1

The correct option is A ${150}^{\circ }$

Sum of all angles of a quadrilateral is ${360}^{\circ }$

Fourth angle = ${360}^{\circ }$-(${40}^{\circ }$+${80}^{\circ }$+${90}^{\circ }$) =${150}^{\circ }$