1. ## Difficult Proof - Does ANYBODY know how to do this?

Prove that the angle between the diagonal of a cube is not dependent upon the edge length of the cube.

2. using vectors is faster . . . .

3. How about showing some effort!

We want to teach you to fish, not give you a fish.

4. Originally Posted by Jameson

We want to teach you to fish, not give you a fish.

5. There are different ways of going about this. What class are you taking and what topic on you on?

6. Originally Posted by yeah:)
Prove that the angle between the diagonal of a cube is not dependent upon the edge length of the cube.
You can try to find the value of this angle for any cube. And then show that it's constant and do not depend of cube's edge length.

7. Originally Posted by yeah:)