Question

Can all the four angles of a quadrilateral be obtuse angle?

• A. Yes
• B. No
• C. May be
• D. Cannot be determined

Answer 1

The correct option is B No

$\Rightarrow$ An obtuse angle is greater than ${90}^o$ and by angle sum property, the sum of all four angles of a quadrilateral is ${360}^o$ .

$\Rightarrow$ If we take all four angles greater than ${90}^o$ then, there sum will be obviously greater than ${360}^o$.

Hence, all the four angles of a quadrilateral cannot be obtuse.

Therefore, option $B$ is correct.