Extension of Geoboard Activity from Class

Area of Quadrilaterals

Posts Trees Area
4 0 1
4 1 2
4 2 3
4 3 4

5 0 1.5

6 0 2
6 1 3
6 2 4
6 3 5

7 1 3.5
7 2 4.5
7 3 5.5

The formula A(P,T) = 0.5P + 1T - 1, where A stands for area, P stands for the number of posts, and T stands for the number of trees, still works for all of these examples.