I can't find the Geometr's Sketchpad to download.
Dear Magda Hassan,
Thank you for your comment. Please download a copy of the Geometry Course Materials file above. In the file, it contains a direct link to where Geometer's Sketchpad can be downloaded & installed, on both Macs & PCs. If you have another type of device (e.g. iPad, Chromebook, etc.), other free programs are available, such as GeoGebra's Geometry tool (https://www.geogebra.org/geometry) or Desmos's Geometry tool (https://www.desmos.com/geometry).
Please let me know if any questions arise.