Answers

2016-03-21T14:25:33+05:30
Since, the radius and height are in the ratio 4:7
let radius (r) be 4x and height (h) be 7x

Volume of a cylinder = πr²h
⇒ 1188 = π × (4x)² × 7x
⇒ 1188 = (22/7) × 16x² × 7x
⇒ 1188 = 22 × 16x² × x
⇒ 1188 = 352x³
⇒ x³ = 1188/352 = 27/8
⇒ x = ∛(27/8) = 3/2 = 1.5cm

Hence, radius of cylinder = 4x = 4×1.5 = 6cm
 & Height = 7x = 7×1.5 = 10.5 cm

TSA of Cylinder = 2πr(r+h)
                          = 2×(22/7)×6(6+10.5)
                          = 836.28 cm²
Hope it helps you!
0
thanks a lot......
whats ur good name..
ashwin:D
thanks ashwin for helping ....