Question

find the measure of the missing angle. answer a =

Explanation:

Step1: Recall angle - sum property

The two angles shown are complementary (form a right - angle which is 90°).

Step2: Calculate the missing angle

Let the missing angle be $a$. We know that $a + 42^{\circ}=90^{\circ}$. So, $a=90^{\circ}-42^{\circ}$.

Answer:

$48$