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Carolin · Answer 1 · 2022-09-18T15:56:00+0000

Answer and Step-by-step explanation:

22ft = x (c)

20ft = y (b)

18ft = z (a)

Plug into equation.

$22^(2) = 20^(2) + 18^(2) - 2(20)(18)cosC (X)\\\\484 = 724 - 720cosC\\\\-240 = -720cosC\\\\(1)/(3) = cosC\\\\cosx^(1) ((1)/(3) ) = C\\\\C = 70.5288\\\\$

C ≈ 70.5 is the answer.

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