Circles: Fun Ideas for Getting A-round in Math
By Catherine Sheldrick Ross
"Mathematics comes alive with Circles, a comic, full-color activity book. By playing with a flying disk, a geodesic dome, psychedelic designs, and more, kids teach themselves such concepts as pi, ellipses, and parabolas. Circles reveals the geometry of life in mazes, magic, pinwheels, pickles, and more."