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27 Apr 2017, 02:42
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If the ratio of the circumference of a circle to the area of the same circle is 1 to 3, what is the diameter of the circle?
A. 2
B 3
C. 6
D. 12
E. 18
A. 2
B 3
C. 6
D. 12
E. 18
mogarza08
Joined: 27 Dec 2015
Last visit: 31 Jul 2018
Posts: 26
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Schools: Haas '20 Anderson '20 McCombs '20 Jones '20
30 Apr 2017, 08:53
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I worked backwards by using the answer choices. If we plug in answer choice D:
d=12, then radius = 6 and circumference = 12pi.
now, we can find the area.
A= piR^2 = pi6^2 = 36pi.
circumference: area = 12pi: 36pi reduce this and we get the stated ratio of 1:3
d=12, then radius = 6 and circumference = 12pi.
now, we can find the area.
A= piR^2 = pi6^2 = 36pi.
circumference: area = 12pi: 36pi reduce this and we get the stated ratio of 1:3
