How to visualize conic sections with a paper model.

Visualizing sections of a cone with a model made out of paper. The templates to make the cone and the card are in the book Amazing Math Projects You Can Build Yourself and at https://drive.google.com/file/d/1Iq6anLZ9Ky55dq9kDRt1biAB45X23REJ/view?usp=sharing or https://1drv.ms/b/s!ApKCqZkYyb3ditRd5uCgy6alxbUGlA?e=HzkLTj Buy the book at at https://www.amazon.com/Amazing-Math-Projects-Build-Yourself/dp/193467057X .