An iron pipe an iron pipe 20 centimetre 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
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total surface area is 2×22/7×25/2 (25/2+20)
1100/14×65/2
15400/28cm^2
1100/14×65/2
15400/28cm^2
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