Bunuel wrote:
In the figure to the right, the radius of the larger circle is twice that of the smaller circle. If the circles are concentric, what is the ratio of the shaded region’s area to the area of the smaller circle?
(A) 10:1
(B) 9:1
(C) 3:1
(D) 2:1
(E) 1:1
We can let the radius of the small circle = r, and thus the radius of the large circle = 2r. Let’s first determine the area of the shaded region:
area = (radius of large circle^2
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