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
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 )
Solve the system of equations: 
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