how to calculate the area of quadrilateral ABCD whose sides are 9m, 40m,28m & 15 m

sorry as i dont have enough tym to show how to solve but i can tell u theoritically

1. divide quadrilateral abcd in 2 triangles.
2. then by using herons formula in one triangle i.e. under root s*(s-a)(s-b)(s-c) where  s=1/2 of perimeter of the triangle .
3. do like this for both the triangles then add the area of both the triangles; and u will get ur answer...

pls thumpzz up 4 me...