Question

(a) find m∠abc.

Explanation:

Step1: Recall angle - measure relationship

The sum of the interior angle and the exterior angle at a point is 360°.

Step2: Calculate the measure of ∠ABC

Let \(m\angle ABC=x\). Then \(x + 307.87^{\circ}=360^{\circ}\). Solving for \(x\), we get \(x=360^{\circ}- 307.87^{\circ}\).
\[x = 52.13^{\circ}\]

Answer:

\(52.13^{\circ}\)