The area of the polygon is 27 mi2. What is the formula that shows the length of side a?

Answer 1

I take it this triangle has an area of 27sq/mi?

Side "a" is the shortest.

27=(bh/2) (b is the base)

b^2+c^2-2bc*cosα=a; (b is the mid-length side).

Answer 2

One possible formula is

Area = (apothem)(perimeter) / 2