3
Answer: BSet 5: Circles (Beginner)
Explanation
PROBLEM
Intriguingly, 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)
A.
5pi
B.✓ Correct
10pi
C.
25pi
D.
12pi
Detailed Explanation
[Variation 2] Choice B is the best answer. Circumference = 2 times pi times r = 2 times pi times 5 = 10pi
Why others are wrong:
A: 5pi is incorrect because it does not satisfy the equation.
C: 25pi is incorrect because it does not satisfy the equation.
D: 12pi is incorrect because it does not satisfy the equation.