Question

what angle is supplemental to 80°?
100°
90°
80°
20°

Explanation:

Step1: Recall supplement - angle definition

Two angles are supplementary if their sum is 180°. Let the unknown angle be \(x\). Then \(x + 80^{\circ}=180^{\circ}\).

Step2: Solve for \(x\)

\(x=180^{\circ}-80^{\circ}\)

Answer:

A. \(100^{\circ}\)