00:05 – 咩係畢氏定理? | what is Pythagoras’ Theorem?01:37 – 畢達哥拉斯的證明 | proof by Pythagoras03:02 – 趙爽的證明 | proof by Zhao Shuang05:11 – 利用相似三角形的證明 | proof by similar triangles08:59 – 例子 | example