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The outer and inner diameters of a circular pipe are 6 cm and 4 cm respectively. If its length is 10 cm, then what is the total surface area in sq cm ?

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Outer radius (R) = 3 cm, Inner radius (r) = 2 cm, Height (h) = 10 cm. 

∴ Total surface area of the pipe = Total area of both the bases + Outer CSA + Inner CSA (CSA = Curves surface Area) 

= 2π(R2 – r2) + 2πRh + 2πrh 

= 2π(R + r) (R – r) + 2πh (R + r) 

= 2π(R + r) (R – r + h) = 2π(3 + 2) (3 – 2 + 10) cm2 

= 2π(5) (11) cm2 = 110 π cm2.

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