Measuring Angles with a Protractor for 4th Grade
This lesson covers measuring angles with a protractor for fourth-grade math. Use the examples and practice below to build confidence and skill.
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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