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 8g/cu.cm, then the weight of the pipe is
External radius = 4 cm
Internal radius = 3 cm
Volume of iron = 227×42-32×21cm3= 462cm3
Weight of iron = (462 x 8)gm = 3696 gm = 3.696 kg
Find the surface area (in cm2) of a sphere of diameter 28 cm.
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