Classifying Angles Worksheet
A Grade 4 math worksheet focused on identifying and classifying angles as acute, obtuse, right, or straight.
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Standards
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Classifying Angles
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Date:
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Read each question carefully and classify the angles as acute, obtuse, right, or straight. Use the protractor image as a reference if needed.
1. An angle that measures exactly 90 degrees is called a:
Acute angle
Obtuse angle
Right angle
Straight angle
2. An angle that is less than 90 degrees is called an angle.
3. An angle that is greater than 90 degrees but less than 180 degrees is called an angle.
4. An angle that measures exactly 180 degrees is called a angle.
5. Classify the angle shown below:
6. Classify the angle shown below:
7. Classify the angle shown below:
8. A right angle is smaller than an acute angle.
True
False
Match each angle description with its correct classification.
9. Measures less than 90 degrees
a. Right Angle
10. Measures exactly 180 degrees
b. Acute Angle
11. Measures exactly 90 degrees
c. Straight Angle
12. Measures between 90 and 180 degrees
d. Obtuse Angle