Question

if the complement of. an angle is equal to. the. supplement. of thrice of it find the angle

Answer 1

let the angle be x
complement will be 90-x
by given condition
90-x=180-3x
90=2x
x=45

Answer 2

Complement of $\alpha$ = $90 - \alpha$
Supplement of $\beta = 180- \beta$
Given, 90-$\alpha$ = 180 - 3$\alpha$
⇒$\alpha = 45$°