6
Answer: ASet 1: Circles (Beginner)
Explanation
PROBLEM
A circle has radius 2. What is its area? (Express answer as a number times pi)
A circle has radius 2. What is its area? (Express answer as a number times pi)
A.✓ Correct
4pi
B.
2pi
C.
4pi
D.
6pi
Detailed Explanation
Choice A is the best answer. Area = pi times r squared = pi times 2 squared = 4pi
Why others are wrong:
B: 2pi is incorrect because it does not satisfy the equation.
C: 4pi is incorrect because it does not satisfy the equation.
D: 6pi is incorrect because it does not satisfy the equation.