Find the area of the quadrilateral of one of its diagonals is 40 cm and its off sets 11 cm and 9 cm? Choose the correct choice.
A) 100 cm 2  B) 150 cm 2  C) 333 cm 2  D) 400 cm 2  E) 750 cm 2

Rationale: "1 / 2 * 40 ( 11 + 9 ) = 400 cm 2 answer : d"
Answer: D