Question

What do we call a 180° angle?

• A. Obtuse angle
• B. Straight angle
• C. Equilateral angle
• D. None of these

Hint:

A straight angle measures exactly 180° and forms a straight line.

Answer 1

The Correct Option is B

Step 1: Understanding Angle Types.
An angle is classified based on its degree measure:
- An acute angle is less than 90°.
- A right angle is exactly 90°.
- An obtuse angle is greater than 90° but less than 180°.
- A straight angle is exactly 180°.
Step 2: Verifying the Options.
- Option (1): An obtuse angle is more than 90° but less than 180°.
- Option (2): A straight angle measures exactly 180°, making it the correct answer.
- Option (3): An equilateral angle does not exist as a specific classification for angles.
- Option (4): "None of these" is incorrect because the correct answer is (2).
Conclusion:
Therefore, the correct answer is (2) Straight angle.