Thread: Cuboid

We’ve got cuboid ABCDA’B’C’D’.
= C’AB
= C’AD
= C’AA’
Prove that:
tg + tg +tg ≤ tg tg tg

Hey adam23.

What does tg refer to?

It's tg angles

Originally Posted by chiro

Hey adam23.

What does tg refer to?

Originally Posted by adam23

It's tg angles

Okay. So what is a tg angle? Please give us the definition.

-Dan

I expect it means .

Yes, this is tan.

I tried to use Inequality of arithmetic and geometric means, but nothing's good. So, have you got any idea?