Using area of triangle formula given its vertices we can calculate the areas of triangles ABC and ACD. If you perform this calculation but omit the last step where you take the absolute value. When finding the area of a triangle the formula area ½ base height.
In coordinate geometry the position of a point can be easily defined using coordinates.
Easy way to remember the formula of area of triangle. Lets find the area of a triangle when the coordinates of the vertices are given to us. Now Area of the quadrilateral ABCD Area of triangle ABC Area of triangle ACD We use this information to find area of a quadrilateral when its vertices are given. For Heron formula see Calculator of area of a triangle using Heros formula.