A hollow iron pipe is 21 cm long and its...

A hollow iron pipe is 21 cm long and its exterior diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs `8g//cm^(3)`, then the weight of the pipe is (Take `pi = (22)/(7)`)

3.696 kg

3.6 kg

36 kg

36.9 kg

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