Question

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

Explanation:

Step1: Identify zero - degree line

The zero - degree line is the line where the protractor starts measuring angles. Here, we start from the right - hand side zero.

Step2: Determine rotation direction

We rotate counter - clockwise from the zero - degree line to ray BA.

Step3: Read the angle measure

The ray BA intersects the protractor at 90 degrees.

Answer:

90