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Attachment 19601

I'm having some troubles defining vector OA in both images. Does anyone know how?

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- November 6th 2010, 12:08 PMAniMuSDefining a vector
Attachment 19600

Attachment 19601

I'm having some troubles defining vector OA in both images. Does anyone know how? - November 6th 2010, 01:19 PMAckbeet
In the first picture, you have

Hence, is isosceles. Therefore,

Therefore,

Now we use the law of sines to find That is,

Solve for

Finally, you can use the expression

to find the final vector

In the second problem, you just have the usual

. Or do you need to express the vectors using different variables?