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18 Dec 2017, 21:47
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
97% (00:33) correct
3%
(00:36)
wrong
based on 174
sessions
History
Date
Time
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Not Attempted Yet
In the figure above, what is the circumference of the circle with center C?
(A) 2π
(B) 4π
(C) 5π
(D) 8π
(E) 10π
Attachment:
2017-12-19_0837_003.png [ 7.42 KiB | Viewed 3603 times ]
18 Dec 2017, 22:54
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Bunuel
The circumference of the circle with center C = 2π r (radius)
But what is r? It is distance between (5, 4) and (5,8)=4
Hence circumference of the circle with center C = 2*4*π = 8π
Hence D
19 Dec 2017, 07:26
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Bunuel
Distance between two points: \(\sqrt{(x2-x1)^2+(y2-y1)^2} = \sqrt{(5-5)^2+(8-4)^2}=√16=4\)
Diameter: \(radius*2=(4)*2=8\)
Circumference: \(diameter*π=(8)π\)
(D) is the answer.
