A metallic sphere of radius 12 cm is melted and drawn into a wire, whose radius of cross section is 16 cm. What is the length of the wire?

A. 45 cm
B. 18 cm
C. 90 cm
D. None of these

Volume of the wire (in Cylindrical shape) is equal to the volume of the sphere.

π(16)2 * h = (4/3)π (12)3 => h = 9 cm