Question

find the supplementary angle of the given angle whose measure is 99°.

Explanation:

Step1: Recall the definition of supplementary angles

Supplementary angles add up to \(180^{\circ}\). Let the given angle be \(A = 99^{\circ}\), and its supplementary angle be \(B\). Then \(A + B=180^{\circ}\).

Step2: Solve for the supplementary angle

We can find \(B\) by \(B = 180^{\circ}-A\). Substitute \(A = 99^{\circ}\) into the formula: \(B=180 - 99\).

Answer:

\(81^{\circ}\)