Answer:
35/100 if I remembered correctly, XD
R in this equation refers to the radius
The polygon would have 18 sides. Hope this helps!
Subtract 15 from the depth:
200-15 = 185
Subtract 20 from the width ( 10 from both sides)
250-20 = 230
Area to build on: 185 x 230 = 42,550 square feet.