Solving problems by adding a dimension

Five geometry puzzles solved by a clever shift in perspective. The artwork at the end is by Kurt Bruns Thanks to Daniel Kim for sharing the first two puzzles with me. He mentioned the earliest reference he knows for the tile puzzles is David and Tomei's AMM article titled "The problem of Calissons." The idea to include the tetrahedron volume example was based on a conversation with Po Shen Lo about these puzzles,…