Q.E.D. presents some of the most famous mathematical proofs in a charming book that will appeal to nonmathematicians and math experts alike. Grasp in an instant why Pythagoras's theorem must be correct. Follow the ancient Chinese proof of the volume formula for the formulas of pyramids and learn Archimedes' method for finding the volume of a sphere. Discover the secrets of pi and why squaring the circle really is possible. Study the subtle art of mathematical domino tumbling, and find out how slicing cones helped save a city and put a man on the moon. Q.E.D. takes readers deep into mathematical thought by examining why well-known theorems and formulas are true and presenting them in a visually exciting form.