This is 5th project in the Graphing Calculator series. Here Scratchie will draw conic sections. These are curves that are obtained when we intersect a cone with a plane. Here you can get circles, ellipses and hyperbola. Parabolas are also a conic section but you can not get them here. Click on the orange + sign to change it to - and click on the orange letter labels with the up arrows to increase the value of the corresponding slider by exactly 0.1. My Fill works well for large circles only but will be improved. I would like to thank my collaborators ffred and dapontes for their comments and improvements on this project –in particular ffred for making the great line style gizmo. I would also like to thank room209 and her class for their collaboration and use and evaluation of these projects. Finally I would also like to thank tuck92 for his beautiful color gizmo. Play, take apart, remix and have fun. You can see more about the conic sections at