Question

what is the measure of this angle? m∠abc = ?°

Explanation:

Step1: Determine the measurement

We use the outer scale of the protractor. The ray \(BC\) points to \(0^{\circ}\) (or \(360^{\circ}\)), and the ray \(BA\) points to \(220^{\circ}\).
To find \(m\angle ABC\), we calculate \(360^{\circ}-220^{\circ}\).
$$360 - 220$$

Step2: Calculate the result

$$360-220 = 140$$

Answer:

\(140\)