Types of Angles (Acute, Right, Obtuse) for 4th Grade
To classify an angle, compare it with a right angle: smaller is acute, equal is right, larger but less than a straight line is obtuse. The examples below include straight and reflex angles too, with practice problems and answers.
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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