This set of geometry math adventure books starring Sir Cumference, his friends and family, solving geometry problems. Some concepts covered are: Symmetry, Circumference, Pi, Measurement, Diameter, Radius, Area of Rectangle, Parallelogram, Triangle, Circle, Angles, Geometric Solids, Edges, Points, Faces, Pyramid, Cube, Rectangular Prism, Triangular Prism, Cylinder, Cone, Vertex and more. (5 books, 25 protractors, 25 GeoTool Compasses).