the radii of two cones are in the ratio 2 is to 1 and their volumes are equal what is the ratio of their Heights if the CSA of 1st cone is 100 cm square find CSQof second cone?
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Answer:
CSA of 1st cone = CSA of 2nd cone
⇒πr1l1=πr2l2
∴l2=2l1
⇒πr1l1=2×πr2×2l1
⇒r2r1=πrl14πrl1=14⇒r1:r2=4:1
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