Geometry

Question Analysis

This question focuses on using a protractor to measure an angle. It requires identifying the correct scale on the protractor.

 

Key Concept Explanation

A protractor has two scales (inner and outer) from 0° to 180°. Align one side of the angle with 0° and read the value where the other side crosses the 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 need to 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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