Find C. Round to the nearest tenth.
20 ft
22 ft
A
B
18 ft
C = [? ]
Law of Cosines : c2 = 22 + b2 - 2ab cos C
Enter

47 - 90 = 43

43 - 180 = x

x = 137

i believe the answer is c.

60

step-by-step explanation:

every triangle measures a total of 120 degrees. you have to find angle c. we know that isosceles triangles angles are equal. 60 degrees plus 60 degrees gives you 120.

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)