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Thickness= 1.5cm. External Radius=6cm.
External height=84cm. External volume= (22/7×6×6×84)cm cube.= 9504cm cube. Internal Radius=6-1.5=4.5cm =9/2cm. Internal height=84cm. Internal volume = 22/7×9/2×9/2×84=5346cm cube. So volume of metal used in making cylinder=External volume-Internal volume= (9504-5346)cm cube= 4158cm cube. weight = 4158×7.5=31185 gram. weight in kg= 31185/1000=31.185kg
External height=84cm. External volume= (22/7×6×6×84)cm cube.= 9504cm cube. Internal Radius=6-1.5=4.5cm =9/2cm. Internal height=84cm. Internal volume = 22/7×9/2×9/2×84=5346cm cube. So volume of metal used in making cylinder=External volume-Internal volume= (9504-5346)cm cube= 4158cm cube. weight = 4158×7.5=31185 gram. weight in kg= 31185/1000=31.185kg
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