Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
Learning Math Home
Session 6, Part A: The Pythagorean Theorem
Session 6 Part A Part B Part C Homework
geometry Site Map
Session 6 Materials:

Session 6, Part A:
The Pythagorean Theorem

In This Part: Calculating Area | Squares Around a Right Triangle | The Theorem

In a right triangle, the side opposite the right angle (side c in all of the pictures in Problem A2) is called the hypotenuse.

The problems you just solved illustrate the Pythagorean theorem: In a right triangle, the square built on the hypotenuse is equal in area to the sum of the squares built on the other two sides.

Today, most people think of the theorem as stating a relationship among three numbers, a, b, and c, which represent the lengths of the sides of a right triangle.

The Pythagorean theorem is named for Pythagoras, a Greek mathematician who lived from about 569-500 B.C.E., around the same time as Lao-Tse, Buddha, and Confucius. Pythagoras was the leader of a society that would likely be considered a cult by modern standards. They studied mathematics and numerology, were very superstitious about what they ate and how they lived, and were sworn to secrecy.


Part A: The Theorem adapted from Connected Geometry, developed by Educational Development Center, Inc. p. 197. © 2000 Glencoe/McGraw Hill. Used with permission. www.glencoe.com/sec/math

Next > Part B: Proving the Pythagorean Theorem

Learning Math Home | Geometry Home | Glossary | Map | ©

Session 6: Index | Notes | Solutions | Video


© Annenberg Foundation 2017. All rights reserved. Legal Policy