1. The problem is to find the measure of the angle indicated on the semicircular protractor. 2. A semicircular protractor measures angles from 0° to 180° along its curved edge. 3. The angle indicator line intersects the protractor scale at approximately 100°. 4. Therefore, the measure of the angle is about $100^\circ$. 5. This is a direct reading from the protractor scale, so no further calculation is needed.