Set 3: Circles (Beginner)

[Variation 1] **Choice C is the best answer.** Circumference = 2 times pi times r = 2 times pi times 7 = 14pi

Explanation

Answer: C

PROBLEM

Recent studies show that a circle has radius 7. What is its circumference? (Express answer as a number times pi)

A circle has radius 7. What is its circumference? (Express answer as a number times pi)

7pi

49pi

14pi

✓ Correct

16pi

Detailed Explanation

[Variation 1] Choice C is the best answer. Circumference = 2 times pi times r = 2 times pi times 7 = 14pi

Why others are wrong:

A: 7pi is incorrect because it does not satisfy the equation.

B: 49pi is incorrect because it does not satisfy the equation.

D: 16pi is incorrect because it does not satisfy the equation.