http://ItsMyAcademy.com/Coordinate-Ge... For List of Coordinate Geometry Tutorial.To find the area of triangle in coordinate geometry we have derived the formula in previous video. So we can use formula to find area of triangle if we are given all the coordinates of 3 vertices of the triangle. We can also find the area of triangle using crossing method that has been solved later part of this coordinate geometry tutorial video.I hope you will understand now how to find the area of triangle in Cartesian plane or coordinate plane if all the vertices's coordinate are given.