A cylinder and a cone have equal base and equal height.
Question 1:
A cylinder and a cone have equal base and equal height. The ratio of the radius of base to height is 5 : 12. Find the ratio of the total surface area of the cylinder to that of the cone.
A.7 : 15
B.16 : 9
C.17 : 9
FeedbackLet radius = 5x and height = 12x Then slant height = √[(5x)2 + (12x)2]= 13x Required ratio = 2ᴨr(h+r) : ᴨr(l+r) = 17 : 9
D.9 : 17
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