Question

find the complement 90-a

Answer 1

$$\begin{gathered} \mathrm{Measure}\mathrm{of}\mathrm{the}\mathrm{given}\mathrm{angle}=90°-\mathrm{a} \\ \mathrm{Measure}\mathrm{of}\mathrm{its}\mathrm{complement}=90°-\left(90°-\mathrm{a}\right)=\mathrm{a} \end{gathered}$$