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17 Jun 2016, 06:05
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D
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Difficulty:
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Question Stats:
83% (01:13) correct
17%
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wrong
based on 63
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A and B are two circles. The radius of A is twice as large as the diameter of B. What is the ratio between the areas of the circles?
A. 1:8.
B. 1:2.
C. 1:4.
D. 1:16.
E. 1:6.
A. 1:8.
B. 1:2.
C. 1:4.
D. 1:16.
E. 1:6.
17 Jun 2016, 06:49
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Given : The radius of A is twice as large as the diameter of B. => R(a) = 2*D(b) = 2*2*R(b) = 4R(b). The radius are in ratio of 1:4 thus the area will be in the ratio of square of radius. 1:16. Hence D.
21 Jun 2019, 08:09
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Radius of b = x,
Diameter of b = 2x,
x = 2 , A = 2^2* pie = 4pie
keeping x = 2
Radius of A = 2 * 2x, Radius = 8
Area of A = 8^2 * Pie = 64pie
Area of B to Area of A = 4pie/64pie = 1/16
Diameter of b = 2x,
x = 2 , A = 2^2* pie = 4pie
keeping x = 2
Radius of A = 2 * 2x, Radius = 8
Area of A = 8^2 * Pie = 64pie
Area of B to Area of A = 4pie/64pie = 1/16
