Karl Schaffer Co-Artistic Director of MoveSpeakSpin and Emeritus Math Prof De Anza College and MoveSpeakSpin Scotts Valley, California karl_schaffer@yahoo.com http://mathdance.org/ Pi in a Can: A short educational video on circumference, diameter, and perimeter. A Mathematical Hello: A short video on rotations of the arms. Pi in a Can 00:02:51 Text, video, and performance by Karl Schaffer 2021 https://vimeo.com/530016409/d4a37741ff Pi in a Can: A short educational video on circumference, diameter, and perimeter. A Mathematical Hello 00:02:50 Text, video, and performance by Karl Schaffer 2021 https://vimeo.com/543935052/d2e23ee003 A Mathematical Hello: A short video on rotations of the arms.