Question

Find the angle whose supplement is ${125}^{\circ }$.

• A. ${30}^{\circ }$
• B. ${40}^{\circ }$
• C. ${55}^{\circ }$
• D. ${60}^{\circ }$

Answer 1

The correct option is C

${55}^{\circ }$

Let the angle be $x^{\circ }$.

$x+{125}^{\circ }={180}^{\circ }$ [ Sum of two supplementary angles is ${180}^{\circ }$]

$\Rightarrow x={180}^{\circ }-{125}^{\circ }$

$\Rightarrow x={55}^{\circ }$

Required angle = ${55}^{\circ }$