Question

The radius of the base and height of a cylinder are in the ratio 4:5.if the volume is 251.42, then find the C.S.A of the cylinder.

Answer 1

Answer:

Step-by-step explanation:

Hope this will help you...

Let the radius of the cylinder be 4x

And

Let the height of the cylinder be 5x

The volume of cylinder is ( pie r square h) = 22/7 × 4x × 4x × 5x

251.42 = 22/7 ×4x × 4x × 5x

80x = 251.42 ×7 /22

80x = 80 (approximately)

X = 1.....

Radius =4x = 4×1 =4cm.

Height =5x =5×1 =5cm.

So, the CSA of cylinder = (2 pie rh)

=2×22/7×4×5.

125.7 (approximately)...

So, the CSA of a cylinder is 125.7cm

(Approximately).....