Question

Find c.

Round to the nearest tenth.
77
1829
817
C = [.? Ift
Law of Cosines: ca? + b2 - 2ab cos C
Enter

Answer 1

C=1 ft

Explanation:

c2= a2 + b2 - 2ab

= 8^(2) + 7^(2) - 2(8)(7)

= 113 -112

c2= 1 put a square root on c2 and 1

c = 1