Set 2: Circles (Beginner)

**Choice C is the best answer.** Area = pi times r squared = pi times 4 squared = 16pi

Explanation

Answer: C

PROBLEM

A circle has radius 4. What is its area? (Express answer as a number times pi)

8pi

20pi

16pi

✓ Correct

4pi

Detailed Explanation

Choice C is the best answer. Area = pi times r squared = pi times 4 squared = 16pi

Why others are wrong:

A: 8pi is incorrect because it does not satisfy the equation.

B: 20pi is incorrect because it does not satisfy the equation.

D: 4pi is incorrect because it does not satisfy the equation.