the IB SL formula booklet. Round to 3 s.f. if not otherwise specified. The following diagram shows a park bounded by a fence in the shape of a quadrilateral ABCD. A straight path crosses through the park from B to D. AB = 85 m, AD = 85 m, BC= 40 m, CBD = 41', BCD = 120* (b) A B 1 141 40 85 1 C 120 85 diagram not to scale D 20130 Calculate the size of angle BAD, correct to five significant fiqures. [2] The size of angle BAD rounds to 77", correct to the nearest degree. Use BAD = 77" for the rest of this question. [2