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27 Nov 2018, 00:02
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
93% (01:02) correct
7%
(01:30)
wrong
based on 35
sessions
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Date
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Not Attempted Yet
The circumference of circle C1 is 12π and the circumference of circle C2 is 24π. What is the ratio of the area of C2 to the area of C1 ?
A. 2 to 1
B. 3 to 1
C. 4 to 1
D. 6 to 1
E. 8 to 1
A. 2 to 1
B. 3 to 1
C. 4 to 1
D. 6 to 1
E. 8 to 1
28 Nov 2018, 01:14
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Circumference C1 = 12π = 2πr, then r = 6.
Circumference C2 = 24π = 2πr, then r = 12.
\(\frac{Area of C_2}{Area of C_1}\) = \(\frac{πr_2^2}{πr_1^2}\) = \(\frac{12*12}{6*6}\) = 4/1
C is the answer.
Circumference C2 = 24π = 2πr, then r = 12.
\(\frac{Area of C_2}{Area of C_1}\) = \(\frac{πr_2^2}{πr_1^2}\) = \(\frac{12*12}{6*6}\) = 4/1
C is the answer.
