Find the angles A and ACB and the length CD in the roof in the illustration below, where AC = BC. Round lengths of sides to three significant digits and angles to the nearest tenth of a degree.

Question

A. ?A = 21.1°, ?ACB = 132.2°, CD = 2.65 ft
B. ?A = 20.4°, ?ACB = 139.2°, CD = 2.78 ft
C. ?A = 20.4°, ?ACB = 139.2°, CD = 3.25 ft
D. ?A = 21.6°, ?ACB = 127.2°, CD = 2.71 ft
E. ?A = 19.9°, ?ACB = 144.2°, CD = 3.25 ft

Answer 1

Answer: B