Each of the tailor?s three sons sets out to make a beautiful cloak for the king. Two of the brothers fashion cloaks from squares, rectangles, and triangles of brightly colored cloth. The youngest sews a beautiful but unwearable cloak out of circles. The holey cloak is not fit for the king, but the clever tailor uses geometry to craft a solution. Developed by mathematics education expert and curriculum developer Marilyn Burns, Brainy Day Books encourage the teaching and learning of math through literature.