Question

find the height of a cylinder whose is 7cm and the total
surface area is 440square cm​

Answer 1

Step-by-step explanation:

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Answer 2

Radius = 7 cm, Total surface area = 440cm^2.

Let the height of the cylinder be x cm.

Therefore, by the problem

$2 \times \frac{22}{7} \times 7(7 + x) = 440$

$or \: 44(7 + x) = 440$

$or \: 308 + 44x = 440$

$or \: 44x = 440 - 308$

$or \: 44x = 132$

$or \: x = 132 \div 44 = 3$

The height is 3 cm.