Square
This shape has been constructed so that when the vertices A and B are moved, it is always a square.
Try moving these vertices, what changes? What stays the same?
Now draw the diagonals by selecting the segment tool and left-clicking on A and C and then B and D.
Select the point tool and put a point, E, on the intersection point of the two diagonals.
Use the distance tool to check that for any square, the diagonals are the same length and they bisect each other at right angles.
Acknowledgements: http://www.lsp.open.ac.uk/geometry/
Created with GeoGebra |