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An iron pipe 20 cm long has exterior diameter equal to 25 cm.if the thickness of the pipe is 1 cm,find the whole surface area of the pipe.



Length of pipe = 20cm Ext diameter of pipe=25 cm Ext radius=12.5cm Width of pipe=1cm .•. Interior dia of pipe = 24 cm Interior rad. = 12cm TSA of pipe=πh(R×R-r×r) =22/7×20(12.5×12.5-12×12) =440/7(156.25-144) =440/7(12.25) =440×1.75 = 770cm sq.
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