Question

what is the measurement of the angle shown below?
10°
180°
80°
100°

Explanation:

Step1: Read the protractor

The protractor is a semicircle which measures angles from \(0^{\circ}\) to \(180^{\circ}\). We look at the scale (outer or inner) where one arm of the angle is at \(0^{\circ}\) (the straight - line arm). The other arm points to a value.

Step2: Determine the angle measure

Looking at the protractor, if we assume the correct scale (since the angle is more than \(90^{\circ}\) but less than \(180^{\circ}\)), the angle measure is \(100^{\circ}\).

Answer:

\(100^{\circ}\) (the fourth option)