This is a good book for first through third grade students to learn about angle measures in different geometric shapes. In the story a triangle decideThis is a good book for first through third grade students to learn about angle measures in different geometric shapes. In the story a triangle decides that he is not happy with himself and he goes to a shape shifter to give him more angles. He soon becomes very greedy and keeps adding more and more angles, transforming him into various geometric shapes. An activity could ask your students to do with this is to make their own geometric people and share them with the rest of the class. The students would need to describe their shape to the class and talk about how many angles there are, what type of angles they are, and what their shape is called....more