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02 Sep 2018, 23:25
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E
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Difficulty:
25%
(medium)
Question Stats:
83% (01:21) correct
17%
(02:07)
wrong
based on 27
sessions
History
Date
Time
Result
Not Attempted Yet
A round mirror, radius \(5\sqrt{2}\), is encircled by a frame of uniform width. If the circumference of the frame is 20π, what is the area of the frame?
A. \(375\pi\)
B. \(200\pi\)
C. \(100\pi\)
D. \(75\pi\)
E. \(50\pi\)
A. \(375\pi\)
B. \(200\pi\)
C. \(100\pi\)
D. \(75\pi\)
E. \(50\pi\)
03 Sep 2018, 00:45
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Bunuel
Circumference of Frame = 2πR = 20π
i.e. Radius of frame = R = 10
Area of Frame = Area of bigger circle - Area of smaller circle = π(R^2-r^2) = π(10^2 - 5√2^2) = π(100-50) = 50π
Answer: option E
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