66. If the diameters of the concentric circles
shown in the figure below are in the ratio 1:2:
3 then find the ratio of the areas of three
regions.
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Answer:
d=1:2:3
ar=pi d: pi d :pi d
ar =pi 1: pi 2: pi 3
pis get cancelled there after
the ratio of the radius is 1 is to 2 is to 3
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