Question

the volume of solid cylinder is 78848 centimetre cube and ratio of its radiusto its height is 7:8 Find the curved surface area of cylinder

Answer 1

Answer:

CSA=5632 cm^2.

Step-by-step explanation:

Volume of cylinder = πr^2h

78848=22/7×(7x)^2×(8x)

78848×7/22=(49x^2)×(8x)

3584×7=392x^3

25088=392x^3

x^3=25088/392

x^3=64

x=3√64

x=4.

Radius=7x=7×4=28 cm.

Height=8x=8×4=32 cm.

CSA = 2πrh

=2×22/7×28×32

=44×4×32

=44×128

=5632 cm^2.