The areas of the two spheres are in the ratio 1: 4. The ratio of their volume is?  Options:	A) 1:9	B) 1:4	C) 1:8	D) 1:1	E) 1:2
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?