Question

if a figure has three measurements wouldnt it be a three dimensional object ?

Answer 1

Yes.

Answer 2

not always ... a tv screen as width and height, but often times in the store they talk about its diagonal length, but tv screens are flat

Answer 3

For example cuboid - length, breadth and height.

Answer 4

Yes, actually meverett's right, the answer to your question would be not always.