Set 4: Circles (Beginner)

[Variation 1] **Choice C is the best answer.** Circumference = 2 times pi times r = 2 times pi times 5 = 10pi

Explanation

Answer: C

PROBLEM

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

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

25pi

5pi

10pi

✓ Correct

12pi

Detailed Explanation

[Variation 1] Choice C is the best answer. Circumference = 2 times pi times r = 2 times pi times 5 = 10pi

Why others are wrong:

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

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

D: 12pi is incorrect because it does not satisfy the equation.