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 8 g/cm3, then the weight of the pipe is:
- A. 3.6 kg
- B. 3.696 kg
- C. 36 kg
- D. 36.9 kg
✅ Correct Answer: 3.696 kg
Explanation
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