What is the length of the diagonal of a cube whose sides have length 3??

Question

anonymous · Answer

It's a cube, so every side is equal....

anonymous · Answer

yeah, so its 3^2+3^2=x^2 right?

radar · Answer

That would give you the diagonal of one face........not the diagonal of the cube, but it is a step in the right direction.

radar · Answer

|dw:1360452253516:dw|

anonymous · Answer

so, hoe do you do this problem?  like the steps?

anonymous · Answer

* i meant How

radar · Answer

I think you were starting out correctly.  But let me think some more on this.

anonymous · Answer

alright, thank you.. 
and it will be more helpful if you tell me the step to solve this problem.

radar · Answer

I am thinking that the diagonal of the cube would be the result of the calculating the diagonal of one face (as you were starting out to do) and then using that result and one more side of the cube.
|dw:1360453208881:dw|Don't you think that would do it?