The Pythagorean Theorem

Kepler once says: “The Pythagorean Theorem and the Golden Ratio is two of the greatest discoveries in Geometry”.
Do you know Pythagoras Theorem is also known as the Pythagorean Theorem, 100 oxen Theorem, Gou Gu Theorem, Shang Gao Theorem, Chen Zi Theorem, Lu Qiao Theorem? Do you know there are about 400 different methods to proof this theorem?
Kang Hsuan digital teaching aid “The Pythagorean Theorem” leads you to discover, guess, experiment and prove with interaction. Enjoy the amazing process!

It includes introductions of 11 proofs:
1. Pythagorean Proof
2. Euclid's Proof
3. Liu Hui's Proof
4. Mei Arphic's Proof
5. President Garfield's Proof
6. Zhao Shuang's Proof
7. Ptolemy's Proof
8. Da Vinci's Proof
9. Proof using similar (right) triangles
10. Power of The Point Theorem
11. Water Demonstration
12. Secant-tangent Theorem Proof