*A 4,000-year History*

## The Metaphysics of the Pythagorean Theorem

*Thales, Pythagoras, Engineering, Diagrams, and the Construction of the Cosmos out of Right Triangles*

## The Pythagorean Theorem

*The Story of Its Power and Beauty*

## The Pythagorean Theorem for Babies

The Pythagorean Theorem for Babies is intended to introduce babies to the principles of the Pythagorean Theorem, and also provides a colorful proof of the theorem. Mathematician Fred Carlson believes that it's never too early to introduce children, and even babies, to the basic concepts of advanced mathematics. He is sure that after reading this book, the second in his Mathematics for Babies series, you will agree with him! If you like this book, please also check out "Non-Euclidean Geometry for Babies"!

## The Pythagorean Theorem

*A 4,000-Year History*

## The Pythagorean Theorem

Pythagoras, a famous Greek scholar, sathematician, and philosopher, formulated a proof for a theorem that is named for him—the Pythagorean theorem. This theorem states that in any right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. The Pythagorean theorem for right-angled triangles likely was known long before the time of Pythagoras. It was probably used by the ancient Egyptians to construct the pyramids. The theorem is quite believable without rigorous proof to anyone willing to expend a modest effort in some experimentation. One method is to draw a number of right-angled triangles in as wide a variety as practicable and measure all of the sides. It will be determined that, for each triangle drawn, the square of the length of the side opposite the right angle is about equal to the sum of the lengths of the squares of the other two sides. Another method requires the availability of a balance. For this more interesting experiment, construct a right-angled triangle and a square on each side using a piece of sheet metal or cardboard. Then cut out the three squares and weigh them on the balance. The square on the hypotenuse should balance the other two. Contained within this book are some rigorous proofs and some interesting perspectives regarding right angles and right-angled triangles. Doubtless, this theorem is one of the most useful concepts in mathematics.

## The Pythagorean Theorem Eight Classic Proofs

The Pythagorean Theorem is one of the most important ideas in all of mathematics. In this book, students study history and geometry as they explore eight elegant proofs of the theorem from across the centuries. Included are interesting facts about the theorem, a brief biography of Pythagoras, and a list of concepts needed to understand the proofs. Learn how Leonardo Da Vinci, President James A. Garfield, Pythagoras, the Chinese, Bhaskara, and others proved this famous theorem about the right triangle. This would be a useful book for any student taking Geometry, or anyone interested in Mathematics History. NOW WITH A LINK TO POWERPOINT SLIDES YOU CAN DOWNLOAD WITH ANIMATIONS, VIDEOS, PICTURES, AND HYPERLINKS TO SUPPLEMENT THE BOOK. Each proof is displayed in color with an explanation of the steps taken in its geometric presentation. Blackline masters for the proofs, and for manipulatives that offer students hands-on understanding, are included. The book is in PDF format.

## CCSS 8.G.B.7 Applying the Pythagorean Theorem

*Aligns to CCSS 8.G.B.7: Apply the Pythagorean Theorem to determine unknown side lengths in right triangles in real-world and mathematical problems in two and three dimensions.*