Question

Find c and round to the nearest tenth. thank you in advance

Answer 1

Answer and Step-by-step explanation:

90ft = a

55ft = b

50ft = c

Plug into equation.

`50^(2) = 90^(2) + 55^(2) - 2(90)(55)cosC\\\\2500 = 11125 - 9900(cosC)\\\\-8625 = -9900(cosC)\\\\0.8712 = cosC\\\\cos^(-1) (0.8712) = C\\\\29.4`

29.4° is the answer.