Question

Find the angle which is equal to its supplement.

• A. ${65}^{\circ }$
• B. ${45}^{\circ }$
• C. ${180}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is D

${90}^{\circ }$

Let the measure of the anlge be $x^{\circ }$.

Then its supplement = $x^o$
$\therefore x^{\circ }+x^{\circ }={180}^{\circ }\Rightarrow 2x^{\circ }={180}^{\circ }\Rightarrow x^{\circ }={90}^{\circ }$