What A Geome-Treat Published January 3, 2020 at 9:54 AM CST Facebook Twitter LinkedIn Email Listen • 5:34 Mike Katzif / NPR In this final round, every answer is a 2-D or a 3-D shape. Heard on Luke James: Not 'Chi' About Singing. Copyright 2020 NPR. To see more, visit https://www.npr.org.