2
Answer: BSet 2: Circles (Advanced)
Explanation
PROBLEM
A circle has radius 4. What is the arc length of a 180-degree sector? (Express as a number times pi)
A circle has radius 4. What is the arc length of a 180-degree sector? (Express as a number times pi)
A.
4pi
B.✓ Correct
4pi
C.
5pi
D.
8pi
Detailed Explanation
Choice B is the best answer. Arc length = (180/360) times 2 times pi times 4 = 4pi
Why others are wrong:
A: 4pi is incorrect because it does not satisfy the equation.
C: 5pi is incorrect because it does not satisfy the equation.
D: 8pi is incorrect because it does not satisfy the equation.