Question

Find the ratio of T.S.A of cylinder to its C.S.A given that its height and radius are 7.5 and 3.5 respectively

Answer 1

TSA of cylinder is 2πr(r+h)
2×22/7×3.5(7.5+3.5)
=242cm²
CSA of cylinder is 2πrh
2×22/7×3.5×7.5
=165cm²
ratio is TSA/CSA
242/165
242:165 is the ans
hope this is helpful

Answer 2

Given radius = 3.5cm

height = 7.5cm

Curved Surface Area of cylinder = 2πrh

= 2*22/7 *3.5 *7.5

= 165 cm2

Total Surface Area of cylinder = 2πr(h+r)

= 2 *22/7 * 3.5(3.5+7.5)

= 242cm2

Ratio of Total Surface Area of cylinder : Ratio of Curved Surface Area of cylinder

= 242 : 165

= 22 :15