A Note to Apple Mac Users

The Algebra I and Algebra II videos are in .avi format. For Windows PC users they come with a media player optimized for screen-capture video (Camtasia Player), and a front-end menu that allows easy selection of videos.

The menu program and the Camtasia Player will not play on Macs, but the actual video files can be played on Macs with the appropriate software support. To play the .avi files under Quicktime you will need to download the free EnSharpen video codec. EnSharpen is available for Intel-based Apple Mac OSX, Non-Intel-based Apple Mac OSX, and Apple Mac OS9. Be sure to download the appropriate version for your machine. Check your system properties if you are unsure of which version you have.

For some machines, installing EnSharpen is all that is necessary. However Quicktime on some machines seems to have difficulty with the audio portion of the files. If you find this problem, try downloading and installing the VLC media player as an alternative to Quicktime. The video files should play flawlessly with the VLC media player.

The Geometer's Sketchpad CD has versions on the disk that will install to either Apple Mac or PC. The HSC Geometry files are pdf files and Geometer's Sketchpad files that are accessible on either system. No additional software is necessary.