Building a new desk

[EightMoons]

Hey guys, I got a question. Need some math wiz's in here!

 

I have a guy who is willing to build my new desk HOWEVER!!! I'm very particular about one detail.

I want the inside of the desk to be curved the same curve as my monitor.

 

My monitor is a 27" MSI 1800R Curved monitor. I know that the 1800R stands for 1800mm radius. How can I find the degree of this angle for him?

The desk is going to be 84" W x 28" H x 36" D. I will be using 3 of these 27" 1800R monitors. 

 

Can anyone draw a diagram or a blueprint that I can give to him? I'm going to be using 3/4" Walnut Ply. Getting 3 sheets of 4'x8'.

 

PLEASE HELP!

[EightMoons]

The backs and sides are flat, the only curved surface is the face where I sit, curving inwards to act as the same curve as my monitors. 

I really hope someone can help me out.