Geometry

Question Analysis

This question involves using a protractor to measure an angle.

 

Key Concept Explanation

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

 

Step - by - Step Solution

1. First, identify the correct scale:

The initial side of the angle is on the  mark on the left - hand side of the protractor, so we should use the outer - ring scale.

 

2. Then, read the measurement:

Locate where the terminal side of the angle intersects the outer - ring scale. The terminal side intersects the outer - ring scale at

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