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From the top A of a vertical wall AB of height 30 m, the angles of depression of the top P and bottom Q of a vertical tower PQ are 15° and 60° respectively, B and Q are on the same horizontal level. If C is a point on AB such that CB = PQ, then the area (in m 2 ) of the quadrilateral BCPQ is equal to

1. ) 1 3 ( 300 −
2. ) 1 3 ( 300 +
3. ) 1 3 ( 600 −
4. ) 1 3 ( 200 −

Correct answer: ) 1 3 ( 600 −

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