| Rectangle or square |
 |
| Acres = |
Length x Width (in ft.) |
| 43,560 |
|
| Triangular |
  |
| Acres = |
Base x Height (in ft.) |
| 2 x 43,560 |
|
| Parallelogram (opposite sides parallel) |
 |
| Acres = |
Base x Height (in ft.) |
| 43,560 |
|
| Trapezoid (two sides parallel) |
 |
| Acres = |
(A + B) x Width (in ft.) |
| 2 x 43,560 |
|
| More than four sides |
 |
Divide into triangles and/or rectangles;
find the area of each and then add together. |