試題詳解

63. Circle O is the inscribed circle of △ ABC, intersecting the line segments AB , BC , AC at three points of P, Q and R, respectively. Given AB = 5 , BC = 6 , AC = 7 , which of the following is correct?
(A) AP = 2
(B) BQ = 3
(C) The radius of circle O is 2 6 3 .
(D) The area of △ ABC is 83.