Copy of Crowe Activity_1
http://www.maa.org/sites/default/files/images/upload_library/47/Crowe/GeoGebra_Activity_1.html
http://www.maa.org/sites/default/files/images/upload_library/47/Crowe/GeoGebra_Activity_1.html
Crowe Activity_3
http://www.maa.org/sites/default/files/images/upload_library/47/Crowe/GeoGebra_Activity_3.html