A linear map
is an isometric means following :
 T takes collinear points to collinear points, i.e. images of
straight lines are straight lines
 T preserves divisionratios
 T preserves distances
The following applet describes all the isometrics of
.
To use applet proceed as follows :
 Click at some points on the left panel to form a polygon
 Choose a transformation
 See the image in the right panel
