Set 1: Circles (Advanced)

**Choice D is the best answer.** Sector area = (180/360) times pi times 5 squared = 12.5pi

Explanation

Answer: D

PROBLEM

A circle has radius 5. What is the area of a 180-degree sector? (Express as a number times pi)

10pi

25pi

12.5pi

✓ Correct

Detailed Explanation

Choice D is the best answer. Sector area = (180/360) times pi times 5 squared = 12.5pi

Why others are wrong:

A: 10pi is incorrect because it does not satisfy the equation.

B: 25pi is incorrect because it does not satisfy the equation.

C: 25pi is incorrect because it does not satisfy the equation.