Square Barn

Okay. Here's the full explanation. I'll  work out the numbers on the next page,

3/4 of a 50 foot radius circle + 2 wedges of a 40 foot circle  + 1 triangle - 1/2 the barn.
we know all three sides of the triangle. I hope you know at least beginning trigonometry. Knowing the three sides of the triangle, we can find all the angles and the area. You need to find the lower angle of the triangle and subtract from 135. That will be the angle of the wedges.

Go to Step Three for detailed triangle calculations