7
Answer: BSet 5: Circles (Beginner)
Explanation
PROBLEM
Intriguingly, 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)
A.
49pi
B.✓ Correct
14pi
C.
16pi
D.
7pi
Detailed Explanation
[Variation 2] Choice B is the best answer. Circumference = 2 times pi times r = 2 times pi times 7 = 14pi
Why others are wrong:
A: 49pi is incorrect because it does not satisfy the equation.
C: 16pi is incorrect because it does not satisfy the equation.
D: 7pi is incorrect because it does not satisfy the equation.