Question

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Answer 1

CSA of cylinder = 2 pie rh
CSA of cone = pie r √h^2 + r^2

CSA of cone/CSA of cylinder = 5/8 = √h^2 +r^2)/ 2h

10 h = 8√h^2 +r^2.
squaring

100 h^2 = 64 (h^2 + r^2)

100/64 = 1 + (r/h)^2

100/64 -1 = (r/h)^2

36/64 = (r/h)^2

3/4 = r/h