A quadrilateral has four points A(0,1), B(1,-3), C(5,-2) and D(4,0) as coordinates What is the area of quadrilateral ABCD?
+37165 Here is one way (see image below)
calculate the entire area of the large red rectangle
then subtract the areas of the right triangles 1 2 3 4 and the square 5 for your answer
