Question

the measure of an angle is 26.5°. what is the measure of its supplementary angle?

Explanation:

Step1: Recall supplementary - angle definition

Supplementary angles add up to 180°.

Step2: Calculate the supplementary angle

Let the given angle be $\alpha = 26.5^{\circ}$, and the supplementary angle be $\beta$. Then $\beta=180^{\circ}-\alpha$. Substitute $\alpha = 26.5^{\circ}$ into the formula: $\beta = 180 - 26.5=153.5^{\circ}$.

Answer:

$153.5$