find the measure of the missing angle. answer attempt 1 out of 2 a =

Explanation:

Step1: Recall angle - sum property

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

Step2: Set up the equation

Let the missing angle be (a). We have (a + 39^{\circ}=90^{\circ}).

Step3: Solve for (a)

(a=90^{\circ}- 39^{\circ}). (a = 51^{\circ})

Answer:

(51^{\circ})