SOME HELP PLEASE!! QUICK!!

9:12 is the same ratio as 3:4  but not the same as 9:16

I'm assuming that by "similar" you mean that the radiuses are in the same ratio, as well...3:4

So....the ratio of the volumes is just (3/4)^3 = [pi *3^3 *3] [pi * 4^2 *4] = 27/64

And the ratio of the surface areas = 2 pi [ (3)^2 + 3* 3] /2 pi [(4)^2 +4*4] =

[18 ] / [ 32] = 9/16

would 9/12 be the same in ratio form? (9:16)