直線和圓的交點 | Intersections of a Straight Line and a Circle
影片內容：
00:05 – 找出直線與圓的交點 | finding the point of intersection of a straight line and a circle
08:26 – 例子 1 | example 1
12:08 – 例子 2 | example 2
00:05 – 找出直線與圓的交點 | finding the point of intersection of a straight line and a circle
08:26 – 例子 1 | example 1
12:08 – 例子 2 | example 2