Set 4: Circles (Beginner)

[Variation 1] **Choice C is the best answer.** Area = pi times r squared = pi times 5 squared = 25pi

Explanation

Answer: C

PROBLEM

Recent studies show that a circle has radius 5. What is its area? (Express answer as a number times pi)

A circle has radius 5. What is its area? (Express answer as a number times pi)

5pi

10pi

25pi

✓ Correct

30pi

Detailed Explanation

[Variation 1] Choice C is the best answer. Area = pi times r squared = pi times 5 squared = 25pi

Why others are wrong:

A: 5pi is incorrect because it does not satisfy the equation.

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

D: 30pi is incorrect because it does not satisfy the equation.