simple help for dummies

Hey,

I very (very!) new at this, and i need to do something that i cannot do without grasshopper.

i burned hours on hours trying to this by myself (without grasshopper) and it's impossible.

I attached the file I'm on.

I need that the end (end means quarter of circle) of this wooden thing will go down to the ground, when one side of it (there is inner and outer side) is getting shorter, and the other side it laying down until it's flat on the ground. In the file there is what i did by hand, nothing like it's supposed to be. the angle of each wood triangle is different and it's location..

The only line it needs to stick to is the line of the outer circle.

Please please help me, I'm desperate.