The areas of the two spheres are in the ratio 1: 4. The ratio of their volume is?	Select.
A) 1:4  B) 1:16  C) 1:8  D) 1:64  E) 2:3
4πr12 : 4πr22 = 1 : 4   r1 : r2 = 1 : 2   4/3 πr13 : 4/3 πr23   r13 : r23 = 1 : 8   ANSWER:1:8
<result>C</result>
The areas of the two spheres are in the ratio 1: 4. The ratio of their volume is?