A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thick

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✪ Choose the correct option.

A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs cm%5E3, then the weight of the pipe is

A. 720
B. 900
C. 1200
D. 1800

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