A blacksmith have big iron ball of diameter
36cm. He first formed four identical
cylindrical rod out of this ball for some
construction work. When he finished his
work with the cylindrical rod, he again
mixed all the iron rod and formed some
identical small balls, each of radius 9cm.
If the diameter of each cylinder
formed by him is 12cm, then height
of each of them is-
(a) 54cm
(b) 36cm
(c) 45cm
(d) 72cm
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