Question

the complement of a 45° angle = ?°

Explanation:

Step1: Recall complement - angle formula

Complementary angles add up to 90°. Let the angle be $\theta = 45^{\circ}$, and its complement be $x$. Then $\theta+x = 90^{\circ}$.

Step2: Solve for the complement

$x=90^{\circ}-\theta$. Substitute $\theta = 45^{\circ}$ into the formula, so $x = 90^{\circ}-45^{\circ}$.
$x = 45^{\circ}$

Answer:

$45$