10
Answer: BSet 2: Circles (Beginner)
Explanation
PROBLEM
A circle has radius 3. What is its area? (Express answer as a number times pi)
A circle has radius 3. What is its area? (Express answer as a number times pi)
A.
12pi
B.✓ Correct
9pi
C.
3pi
D.
6pi
Detailed Explanation
Choice B is the best answer. Area = pi times r squared = pi times 3 squared = 9pi
Why others are wrong:
A: 12pi is incorrect because it does not satisfy the equation.
C: 3pi is incorrect because it does not satisfy the equation.
D: 6pi is incorrect because it does not satisfy the equation.
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