Set 2: Circles (Beginner)

[Variation 1] **Choice C is the best answer.** Circumference = 2 times pi times r = 2 times pi times 11 = 22pi

Explanation

Answer: C

PROBLEM

Recent studies show that a circle has radius 11. What is its circumference? (Express answer as a number times pi)

A circle has radius 11. What is its circumference? (Express answer as a number times pi)

24pi

11pi

22pi

✓ Correct

121pi

Detailed Explanation

[Variation 1] Choice C is the best answer. Circumference = 2 times pi times r = 2 times pi times 11 = 22pi

Why others are wrong:

A: 24pi is incorrect because it does not satisfy the equation.

B: 11pi is incorrect because it does not satisfy the equation.

D: 121pi is incorrect because it does not satisfy the equation.