Question

If A (-5, 7), B (-4, -5), C (-1, -6) and D (4, 5) are the vertices of a quadrilateral, find the area of the quadrilateral ABCD.

Answer 1

By joining B to D, you will get two triangles ABD and BCD.

Now, the area of ΔABD

So, the area of quadrilateral ABCD = 53 + 19 = 72 square units.