Proof AB=3.6sin0.2

i've done.

$\displaystyle \frac{a}{sin0.4} = \frac{1.8}{sin1.37}$

$\displaystyle \rightarrow a=\frac{1.8sin0.4}{sin1.37}$

but duno how to derive the answer.

thanks!

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- Feb 6th 2010, 03:37 AMBabyMiloProof in a triangle.
Proof AB=3.6sin0.2

i've done.

$\displaystyle \frac{a}{sin0.4} = \frac{1.8}{sin1.37}$

$\displaystyle \rightarrow a=\frac{1.8sin0.4}{sin1.37}$

but duno how to derive the answer.

thanks! - Feb 6th 2010, 03:43 AMProve It
- Feb 6th 2010, 04:00 AMBabyMilo
- Feb 6th 2010, 05:35 AMSiriusAlpha
Is it just,

$\displaystyle a=\sqrt{2*1.8^2-2*1.8*1.8cos0.4}$

$\displaystyle a=\sqrt{2*3.24-3.6*1.8(0.921)}$

$\displaystyle a=\sqrt{2*3.24-3.6*1.65}$

Or is there something I'm not getting D: - Feb 6th 2010, 06:29 AMBabyMilo