6
Answer: BSet 1: Circles (Advanced)
Explanation
PROBLEM
A circle has radius 4. What is the area of a 90-degree sector? (Express as a number times pi)
A circle has radius 4. What is the area of a 90-degree sector? (Express as a number times pi)
A.
8pi
B.✓ Correct
4pi
C.
16pi
D.
8pi
Detailed Explanation
Choice B is the best answer. Sector area = (90/360) times pi times 4 squared = 4pi
Why others are wrong:
A: 8pi is incorrect because it does not satisfy the equation.
C: 16pi is incorrect because it does not satisfy the equation.
D: 8pi is incorrect because it does not satisfy the equation.