1. Pythagorean Theorem By Abdullah Alsowyan Dr. Newberry

2. Have you ever thought in the length of each hypotenuse in the triangles on the rooftops? Do you know that if you know the length of two hypotenuse you can know the length of the third hypotenuse?

3. The history of Pythagoras He lived between 570 - 495 BC He was born on the island of Samos. He is a scientist in mathematician. There is a few information about his personal life. However, Pythagoras is now known as the finder of "Pythagoras Theorem" that it helps to find the value of the hypotenuse in right-angle triangles.

4. a 2 + b 2 = c 2 About Pythagorean theorem The definition of Pythagorean theorem is: in a right triangle, the square of the hypotenuse is equal to the squares of the two sides. In the math language: A B C

5. None of this shapes is right What is the triangle that we are looking for?

6. This shape and the similar of this shape are our targets in Pythagorean theorem which should contain 90 degrees by two sides of the triangle. 90

7. Example 1 The equation said: a 2 + b 2 = c 2 (4x4) + (5x5) = c 2 16 + 20 = 36 √36 = 6 C = 6 A = 4 B = 5 C = ?

8. Example 2 A = 6 C = 10 B = ? The equation said: a 2 + b 2 = c 2 (6*6) + b 2 = (10*10) 36 + b 2 = 100 36 + 64 = 100 √64 = 8 b = 8

9. Try by yourself: A = 8 B = 10 C = ? Solve the problem and after you done click on the mouse: Sorry, this is not right triangle

10. Try by yourself 2: A = 3 B = 4 Solve the problem and after you done click on the mouse: The equation said: a 2 + b 2 = c 2 (3x3) + (4x4) = c 2 9 + 16 = 36 √25 = 5 C = 5 C = ?

11. Review: - We can use Pythagorean theorem with the right triangle. - The equation of the Pythagorean theorem is a 2 + b 2 = c 2 - The right triangle is a triangle that containing an angle of 90 degrees. - By using Pythagorean theorem we can know the value of A, B or C if we known the value of two of them

12. Helpful Link: http://www.regentsprep.org/regents/math/geometry/gp13/Pythag.htm http://www.cut-the-knot.org/pythagoras/index.shtml Pythagorean Theorem - MathHelp.com - Geometry Help The Objectification of the Right-angled Triangle in the Teaching of the Pythagorean Theorem: An Empirical Investigation Thank you