How to figure pond acreage.

Rectangle shaped pond:  Length (feet) x Width (feet) divided by 43,560 = surface acre

Circle shaped pond: 3.14 x R2 (feet) divided by 43560 = surface acre

Triangle shaped pond: Length (feet) of 1 side x Width (feet) (W = the distance from the Length side to the top of the triangle) divided by 2, which is divided by 43560 = surface acre