Show that the quadrilateral with vertices `(3, 2), (0, 5), (-3, 2), (0, -1)` is square.

By method, show that the quadrilateral with vertices A(1,2,-1), B(8,-3,-4), C(5,-1,1),D(-2,1,4) is a parallelogram.

Find the area of the quadrilateral with vertices A(1,2), B(2,2), C(3,3), D(5,3).

Find the area of the quadrilateral whose vertices are (-4,-2),(-3,-5),(3,-2),(2,3)

The area of the quadrilateral whose vertices are (1,2)(6,2),(5,3) and (3,4) , is

Show that the DeltaABC with vertices A ( 0,4, 1) , B ( 2, 3, -1) and C ( 4,5,0) is right angled.

Show that A(3, 2), B(0, 5), C(-3, 2) and D(0, -1) are the vertices of a square.

Find the are of quadrilateral ABCD whose vertices are A(3, -1), B(9, -5), C(14, 0) and D(9, 19).