Okay. I have a quick question.

If I have a hypotnuse of 13, and I know an angle is squareroot3/2 (cos 30) how do I find out the EXACT length of the adjacent side?

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- Nov 18th 2009, 05:43 PMabc10Exact Values
Okay. I have a quick question.

If I have a hypotnuse of 13, and I know an angle is squareroot3/2 (cos 30) how do I find out the EXACT length of the adjacent side? - Nov 19th 2009, 07:40 AMGrandad
Hello abc10I assume you mean the angle is $\displaystyle 30^o$, and its cosine is $\displaystyle \frac{\sqrt3}{2}$, in which case all you can do is to say that the length of the adjacent side is $\displaystyle 13\cos 30^o = \frac{13\sqrt3}{2}$. That's its exact value. Any attempt to write this as a decimal will give an approximate value.

Grandad - Nov 19th 2009, 07:42 AMBabyMilo
how about $\displaystyle \frac{\sqrt{3}*13}{2}$ ?