A* Similar shapes question please help

Or am i doing something wrong?

X and Y are two geometrically similar solid shapes.
The total surface area of shape is X 450 cm2
The total surface area of shape is Y 800 cm2


The volume of shape X is 1350 cm3

Work out the volume of shape Y



I did 800/450 = 0.75
0.75 x 1350 = 2400

but the answer is 3200, so it looks like you add 800, the surface area of Y onto it?

Or am i doing something wrong?


Thanks! ;D

X and Y are two geometrically similar solid shapes.
The total surface area of shape is X 450 cm2
The total surface area of shape is Y 800 cm2


The volume of shape X is 1350 cm3

Work out the volume of shape Y



I did 800/450 = 0.75
0.75 x 1350 = 2400

but the answer is 3200, so it looks like you add 800, the surface area of Y onto it?

Or am i doing something wrong?


Thanks! ;D

I’m lazy to write in full but scalefactor of area is not the same as volume you have to square root it then cube it

You do realise you're replying to an 8-year-old thread?