Question

Use the law of cosines to find the value of cos theta. Round your answer to two decimal places.

Answer 1

Do you know the law of cosines?

Answer 2

no idea i just left it alone and moved on thanks anyways

Answer 3

For any triangle with angles A,B,C,
and with opposite sides (to these angles) respectively a,b,c

\[c^2=a^2+b^2-2ab\cos C\]

Answer 4

so if you look are your picture

Which side do you think is side c ?

Answer 5

the side c, is the side opposite to the angle theta (angle C)

so

\[(5.7)^2 = (9.8)^2+(10.2^)2-2(9.8)(10.2)\cos(\theta)\]

Answer 6

*\[(5.7)^2 = (9.8)^2+(10.2)^2-2(9.8)(10.2)\cos(\theta)\]