Question

24) The total surface area of a cylinder is 440m2. Find the height of the cylinder if its radius
is 7 cm​

Answer 1

Answer :

• Height of cylinder is 3m

Given :

• Total surface area of cylinder is 440m²
• Radius is 7cm

To find :

• Height of cylinder

Solution :

Given ,

• Total surface area of cylinder is 440m²

As we know that,

• Total surface area of cylinder = 2πr(r + h)

where , r is radius and h is height

》Total surface area of cylinder = 2πr(r + h)

》2 × 22/7 × 7 (7 + h) = 440

》2 × 22 (7 + h) = 440

》44(7 + h) = 440

》(7 + h) = 440/44

》(7 + h) = 10

》h = 10 - 7

》h = 3

》h = 3m

Hence , Height of cylinder is 3m