Question

Find the supplement of the ${123}^{\circ }$

Answer 1

If sum of two adjacent angles is ${180}^{\circ }$ then they are said to be supplementary
$\therefore {123}^{\circ }+\text{angle}={180}^{\circ }\therefore \text{angle}=180-123={57}^{\circ }$
$\therefore \text{Supplementary angle of}{123}^{\circ }is{57}^{\circ }$