66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
Let the length of the wire be h.
Radius r =1/2 mm = 1/20 cm
πr2h = 66
=> h= (66 x 20 x 20) x (7/22) = 8400cm = 84m
Find the surface area (in cm2) of a sphere of diameter 28 cm.
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