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getting angles

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how do I get angle of a triangle not right angled when I know three sides

Guest Mar 10, 2017
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how do I get angle of a triangle not right angled when I know three sides

$$Cosine \ set$$

$$a^2=b^2+c^2-2bc\ cos\alpha$$

$$\alpha=arccos\frac{b^2+c^2-a^2}{2bc}$$

$$\beta=arccos\frac{a^2+c^2-b^2}{2ac}$$

$$\gamma=arccos\frac{a^2+b^2-c^2}{2ab}$$

!

asinus  Mar 10, 2017

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