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In the Cartesian plane four points P, Q, R, S have co-ordinates (1, 1), (4, 2), (4, 4) and (1, 4). The area of the quadrilateral PQRS is

In the Cartesian plane four points P, Q, R, S have co-ordinates (1, 1), (4, 2), (4, 4) and (1, 4). The area of the quadrilateral PQRS is

(a)

9

(b)

7.5

(c)

4.5

(d)

Impossible to find unless the lengths of the diagonals are known

Answer:

Explanation