3
Answer: DSet 3: Circles (Beginner)
Explanation
PROBLEM
Intriguingly, 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)
A.
121pi
B.
11pi
C.
24pi
D.✓ Correct
22pi
Detailed Explanation
[Variation 2] Choice D is the best answer. Circumference = 2 times pi times r = 2 times pi times 11 = 22pi
Why others are wrong:
A: 121pi is incorrect because it does not satisfy the equation.
B: 11pi is incorrect because it does not satisfy the equation.
C: 24pi is incorrect because it does not satisfy the equation.