A solid of radius is r cm is cut into 2 equal halves. The ratio between the surface area of first to the total surface area of both the peaches so obtained is
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Answer:2:1
Explanation:let, radius of first sphere= 2r
radius of sphere when it is halved
=r
thus, ratio of full sphere with redprct to halved sphere
= 4×22/7×(2r)^2:2×4×22/7×(r)^2
=2:1
required ratio is 2:1
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