A and B are two circles. The radius of A is thrice as large as the diameter of B. What is the ratio between the areas of the circles?	Choose the correct choice from the following answers.
A) 1:18.  B) 1:20.  C) 1:4.  D) 1:36.  E) 1:16.
Given : The radius of A is thrice as large as the diameter of B. =&gt; R(a) = 3*D(b) = 3*2*R(b) = 6R(b). The radius are in ratio of 1:6 thus the area will be in the ratio of square of radius. 1:36. Hence 1:36..
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A and B are two circles. The radius of A is thrice as large as the diameter of B. What is the ratio between the areas of the circles?