Question

Using law of cosines, what is angle X to the nearest degree

Answer 1

Answer:79 degrees

Explanation:

Jus took the test hope this helps

Answer 2

`X=68\°`

Explanation:

we know that

Applying the law of cosines to the triangle of the figure

`yz^2=xy^2+xz^2-2(xy)(xz)cos(X)`

substitute the given values

`9^2=8^2+8^2-2(8)(8)cos(X)`

Solve for X

`81=64+64-128cos(X)`

`81=128-128cos(X)`

`128cos(X)=128-81`

`128cos(X)=47`

`cos(X)=(47)/(128)`

using a calculator

`X=cos^(-1)((47)/(128))`

`X=68\°`