An iron pipe 20 cm long has external diameter equal to 25 cm if the thickness of the pipe is 1 cm find the total surface area of the pipe
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total surface area of cylinder = 2πr(h+r)
=2×22/7×12.5(20+12.5)
=2553.52
=2×22/7×12.5(20+12.5)
=2553.52
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