👉 In geometry, a point or line that is in the same plane with another point or line is called a coplanar point. In other words, two points are coplanar if they lie on the same plane and do not intersect each other. For example, the points (1, 2) and (-3, -4) form a coplanar pair of points because they both lie on the line y = x, which is the same as the x-y plane.
