Question

The radius & height of a cylinder are in ratio 2:7, volume of the cylinder is 704 sq cm.Find the surface area.

Answer 1

FORMULA FOR VOLUME OF CYLINDER = pi X r^2 X h

Let the height be 2x

Radius = 7x

Volume = pi X 49x^2 X 2x = 3.14 X 98x^3 = 8316

x^3 = 8316 / 3.14*98 = 27.024567 cm

x = 3 cm

HEIGHT = 6 cm Radius = 21 cm

FORMULA FOR TOTAL SURFACE AREA = 2pirh + 2pir^2

= 2pir ( r + h)

= 2 X 3.14 X 21 X 27 = 3560.76 cm^2

Read more on Brainly.in - https://brainly.in/question/7016814#readmore