Set 3: Circles (Beginner)

[Variation 1] **Choice D is the best answer.** Area = pi times r squared = pi times 4 squared = 16pi

Explanation

Answer: D

PROBLEM

Recent studies show that a circle has radius 4. What is its area? (Express answer as a number times pi)

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

4pi

8pi

20pi

16pi

✓ Correct

Detailed Explanation

[Variation 1] Choice D is the best answer. Area = pi times r squared = pi times 4 squared = 16pi

Why others are wrong:

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

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

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