Question

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

Explanation:

Step1: Identify zero - degree line

The zero - degree line is where ray BC lies on the protractor.

Step2: Read the angle measurement

We read the outer - scale of the protractor as the ray BA is on the outer - scale side. The value where ray BA intersects the outer - scale is 120.

Answer:

$120^{\circ}$