Which of the following is NOT a measurement of an acute angle?
A. 15°
C. 60°
B. 80°
D. 100°

An acute angle is an angle that measures less than 90°.

Let's evaluate the given angles:
- A. 15°: This is less than 90°, so it is an acute angle.
- B. 60°: This is also less than 90°, so it is an acute angle.
- C. 80°: This is less than 90°, making it an acute angle.
- D. 100°: This is greater than 90°, so **it is not an acute angle**.

Thus, the correct answer is **D. 100°**.

Would you like further details or have any questions?

Here are 5 related questions:
1. What is the definition of an obtuse angle?
2. How do you classify angles based on their measurement?
3. Can an angle be classified as both acute and right?
4. What is the sum of the angles in a triangle, and can all angles be acute?
5. How would you measure an angle using a protractor?

**Tip:** Acute angles are always less than 90°, while obtuse angles are more than 90° but less than 180°.

Which of the following is NOT a measurement of an acute angle? A. 15° B. 60° C. 80° D. 100°

Learn how to classify angles as acute or obtuse with a detailed explanation. Find out why 100° is not an acute angle, while 15°, 60°, and 80° are. This problem is ideal for students in Grades 6-8, focusing on understanding angle measurements and classifications.

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