an 18cm long iron pipe has an external diameter diameter of 24cm. if the thickness of the pipe is 1cm, find the total surface ares of a pipe
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Answer:
External diameter of pipe= 24 cm
Hence external radius= 24/2 cm= 12 cm
Internal radius= 12cm - thickness of pipe
12cm-1cm=11cm
Total surface area of pipe= 2x22/7x11cm(11cm+18cm)
2005.14cm2
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