Geometry

Question Analysis

This question is about using a protractor to measure an angle.

 

Key Concept Explanation

A protractor has two sets of scales (inner and outer), both ranging from 0° to 180°. To measure an angle, align one side with the 0° mark on the protractor and read the value where the other side crosses the appropriate scale.

 

Step - by - Step Solution

1. Determine the appropriate scale:

Since the initial side of the angle is lined up with the  mark on the left - hand side of the protractor, we should use the outer - ring scale.

 

2. Read the measurement:

Follow the terminal side of the angle to the point where it intersects the outer - ring scale. The terminal side intersects the outer - ring scale at

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