Types of Angles (Acute, Right, Obtuse) for 4th Grade
An angle is acute if it measures less than 90 degrees, right if exactly 90, and obtuse if between 90 and 180. Comparing to a square corner is the quickest visual test. The examples below cover all three, with practice problems and a full answer key.
DETAILED EXPLANATION
An angle is formed by two rays sharing an endpoint. A right angle is 90°. An acute angle is less than 90°. An obtuse angle is greater than 90° but less than 180°.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
What type of angle is 45°?
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 45° is less than 90°, so it is an acute angle.
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