- #1

Saladsamurai

- 3,020

- 7

**[SOLVED] NEED Help (Basically a Law of Cosines problem)**

So in this problem, all I have to do is to solve it is find out by how much cables AC and AB elongate.

I thought I could just break it into two Right triangles and just use similar triangles (before and after elongation)

If you look at the upper right triangle, let's call it ACO, where O denotes the point on the wall halfway between C and B.

Then I tried doing,

[tex]\frac{AC}{OA}=\frac{AC'}{OA'}[/tex]

[tex]\Rightarrow AC'=\frac{300}{300\cos30}*(300\cos30+2)[/tex]

But this does not work. . . why the hell not??

My prof gave us the hint: "Use Law of Cosines to find the lengths of AC or AB after elongation"

How do I use Law of Cos if I don't know the angles after elongation, and moreover what is wrong with the process I tried?

I hate all of my classes. I miss physics.

Casey