Question

I'm supposed to find the length of x but don't know how

Answer 1

By definition:

`\cos (angle)=\frac{\text{adjacent side}}{Hypotenuse}`

From the picture:

`\begin{gathered} \cos (60)=(x)/(20) \\ (1)/(2)=(x)/(20) \\ (1)/(2)\cdot20=x \\ 10=x \end{gathered}`