Question

Which of the following is true if $\angle Aand\angle B$ are supplementary angles?

a) $\angle A+\angle B={180}^{\circ }$
b)$\angle A+\angle B={90}^{\circ }$
c)$\angle A-\angle B={90}^{\circ }$
d)$\angle A-\angle B={180}^{\circ }$
$\left[1\right]$

Answer 1

For two angles to be supplementary, their sum is equal to ${180}^{\circ }$.
So, $\angle A+\angle B={180}^{\circ }$
$\left[1\right]$