# Properties in two-dimensional lattice

- Author:
- Idan Tal

## Properties in two-dimensional lattice

The applet presentsat two-dimensional lattice in which two toolbars can be used to change the
numbers of the rows and the columns. One can drag each of the vertices of the
basic quadrilateral, thus changing its sides, since the areas in each of the
rows constitute an arithmetic progression, and similarly the areas of the
columns. The common differences of the areas of the rows and the columns are
shown on the screen. The screen also shows the connection between the distance
between the mid-points of the external quadrilateral and the distance between
the mid-points of the corner sub-quadrilateral (left corner top row).