Set 5: Circles (Beginner)

[Variation 1] **Choice C is the best answer.** Circumference = 2 times pi times r = 2 times pi times 3 = 6pi

Explanation

Answer: C

PROBLEM

Recent studies show that a circle has radius 3. What is its circumference? (Express answer as a number times pi)

A circle has radius 3. What is its circumference? (Express answer as a number times pi)

9pi

8pi

6pi

✓ Correct

3pi

Detailed Explanation

[Variation 1] Choice C is the best answer. Circumference = 2 times pi times r = 2 times pi times 3 = 6pi

Why others are wrong:

A: 9pi is incorrect because it does not satisfy the equation.

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

D: 3pi is incorrect because it does not satisfy the equation.