# Finding x and y components from an angleplease help!

1. Aug 23, 2010

### Null_

1. The problem statement, all variables and given/known data
A unit vector lies in the xy plane, at an angle of 131 degrees from the +x axis, with a positive y component. What is the unit vector?

2. Relevant equations

cos[STRIKE]O[/STRIKE]=adj/hyp

3. The attempt at a solution

cos131*=adj/hyp
I know that the z component is obviously 0 (xy plane). The x component is negative in order for the angle to be 131*.

So...
-.656=adj/hyp

And...
((sqrt)x^2+y^2)=1 since it's a unit vector.

Basically, I don't know where to go from here. I know the magnitude is 1, and I know what the angle is, but I don't know how to find out the x and y component values. Any help is greatly appreciated.

2. Aug 23, 2010

### Null_

Edit-
I got it. Duh. The hypotenuse has to be 1. Then cos0=Ax, and it's all plugging in stuff from there.

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