The technique of boxing in a triangle and determing its area by using rectangle and right triangle areas on a graph can be used with all real number coordinates (including fractions and decimals)....

The technique of boxing in a triangle and determing its area by using rectangle and right triangle areas on a graph can be used with all real number coordinates (including fractions and decimals). However, if th coordinates of the vertices happen to be integers, what can you definitively say about the area of the triangle and why?