the iron pipe 20 cm long has external diameter equal to 25 cm to the class of the pipe is 1 centimetre find the total surface
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2*22/7*12.5+2*22/7*12+2*22/7*[12.5*12.5-12*12]
78.57+75.43+77
231cm^2
78.57+75.43+77
231cm^2
ash7177:
very very wrong
bad
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