If P(2,1) Q(4,2) R(5,4) S(3,3) Are the vertices of a quadrilateral PQRS. Find its area

If P(2,1) Q(4,2) R(5,4) S(3,3) Are the vertices of a quadrilateral PQR

1.	If P(2,1) Q(4,2) R(5,4) S(3,3) Are the vertices of a quadrilateral PQRS. Find its area
Answer» It\'s so easy