The Question : 208 people think this question is useful There is a point $(x,y)$, and a rectangle $a(x_1,y_1),b(x_2,y_2),c(x_3,y_3),d(x_4,y_4)$, how can one check if the point inside the rectangle? The Question Comments : sorry, I can’t find proper tags for this question, please help me to improve it Similar to stackoverflow.com/questions/2752725/… I have just read