Find the area of the quadrilateral of one of its diagonals is 30 cm and its off sets 10 cm and 6 cm? Pick.
A) 189 cm 2  B) 150 cm 2  C) 240 cm 2  D) 177 cm 2  E) 187 cm 2

Rationale: "1 / 2 * 30 ( 10 + 6 ) = 240 cm 2 answer : c"
Answer: C