Solving Sphere Ratio Problem: Diameters, Areas & Volumes

[Paradiselovek]

Plz help me on this problem:

THe diameter of a certain sphere is 2 times the diameter of a second sphere.

B what is the ratio of their areas?
C. What is the ratio of their volumes?

I try to put 1 and 2 as a diameter of the sphere then compare its areas and volumes but I'm not sure if the ratio is a 100% correct. Plz help me on this.

 

[Mark44]

What did you get for spheres of diameter 1 and 2?

What do you get for spheres of diameter d and 2d?