Measuring Angles with a Protractor for 4th Grade
To measure an angle with a protractor, place the center on the vertex, align the zero line with one ray, and read where the other ray crosses the scale. Choosing the right scale of the two is where most errors happen. The examples below show that, with practice.
DETAILED EXPLANATION
A protractor is used to measure angles in degrees. Place the center on the vertex, align one ray with 0°, and read where the other ray crosses the scale (inner or outer).
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
An angle measures 55° on the protractor. Is it acute, right, or obtuse?
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 55° is less than 90°, so it is acute.
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