Question

the metal pipe is 82 cm long the inner diameter is 12 cm and Outer diameter is 16 cm find its total surface area

Answer 1

h= 82 cm
let inner diameter be, d= 12 cm
therefore, r= 6 cm
let outer diameter be, D= 16 cm
therefore, R= 8 cm 
TSA of cylinder= 2 pi (R-r) [(R-r)+h]
                        = 2 x 22/7 x (8-6) [(8-6)+82]
                        = 2 x 22/7 x 2 [2+82]
                        = 4 x 22/7 x 84
                        = 4 x 22 x 14
                        = 1232 sq. cm

Answer 2

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