20. Which of the following can be used to solve for the length of side a?
a. a?-bc-2bc cos A b.ba? +c-2ac cos B c. c-a'+b+-2ab cos C d. sinA.sinB =sin C aь с
21. Find MZA
a. 33.6 b. 54.7" c. 62.2 d. 84.3" 22. What is the length of side b? a. 6.36 b.7.11 C. 7.78 d. 8.06
23. The diagram shows the cross section of a roof. What is the distance of BC across the base of the roof?
a. 27.2 ft. b. 32.7 ft. c. 35.9 ft. d. 37.4 ft. 24. Apply the law of cosines to calculate the length of side b.
a. 61.52 b. 63,52 C. 60.52 d. 62.52
25. In triangle DEF, side e = 8cm, f= 10 cm, and the angle at Dis 60', find the length of side d.
a. 8.4 b. 9.5 d. 9 C. 8