Question

Find c and round to the nearest tenth

Answer 1

20

Explanation:

Answer 2

Explanation:

<C = ?

a = 22

b = 20

c = 18

Formula

c^2 = a^2 + b^2 - 2*a*b* cos(C)

Solution

18^2 = 22^2 + 20^2 - 2*22*20*cos(C)

324 = 484 + 400 - 880*cos(C)

324 = 884 - 880*Cos(C)

-560 = - 880 * cos(C)

-560 / - 880 = cos(C)

0.63636 = cos(C)

C = cos-1(0.63636)

C =50.48