Christmas Tangram (Geometry&Shape) These NO PREP!Ho, Ho, Ho, Merry Christmas to you all! This set with 20 different figures is all about Santa and friens. Some puzzles are easy to solve, others can be quite challenging. Playing with tangrams is a great way to learn about polygons and compose 2D shapes. They can help students to develop spatial awareness, problem solving skills and fine motor skills. You can use them to introduce or reinforce geometric concepts such as congruence, similarity, sym