Question

angles a and b are supplementary. angle a has a measure of 80°. what is the measure of angle b? the measure of angle b is °.

Explanation:

Step1: Recall supplementary - angle definition

Supplementary angles add up to 180°. So, \(A + B=180^{\circ}\).

Step2: Solve for angle B

Given \(A = 80^{\circ}\), we substitute into the equation: \(B=180^{\circ}-A\). Then \(B = 180 - 80\).

Answer:

100