Find centralized, trusted content and collaborate around the technologies you use most.
Teams
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
我有一条通过点 (x1,y1) 和 (x2, y2) 的线。我想看看点 (x3, y3) 是否位于所述线的“左侧”或“右侧”。我该怎么做?