Question
A hollow cylinder is made up of steel. the difference in
its outer and inner curved surface area is 132cm2.Height of cylinder is 21 cm and sum of the inner and outer radius is also 21 cm. Find the approximate Total surface of the hollow cylinder (in cm 2 )Solution
ATQ,
Given: Difference in curved surface area = 132 cm2 Height h =21cm Find the difference between the outer and inner radii. 
Solve the system of equations: 
Calculate the total surface area:
So, the total surface area is approximately 3466.9 cm².
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