Geometer's SketchPad
Geometer's SketchPad demonstration of the properties of lines. Download the ZIP archive and unpack it. You will need Geometer's SketchPad v4 or v5 to open the included files.
Geometer's SketchPad demonstration of midpoint and distance formula. Download the ZIP archive and unpack it. You will need Geometer's SketchPad v4 or v5 to open the included files.
LearnStar