截線定理 | Intercept Theorem

影片內容：

00:05 – 咩係截線定理? | what is intercept theorem?
02:08 – 截線定理的證明 | proof of intercept theorem
04:19 – 中點定理和截線定理的分別 | difference between mid-point theorem and intercept theorem
05:07 – 例子 1 | example 1
06:15 – 例子 2 | example 2