Geometrie plana

Teorema sinus cosinus

February 13, 2015 admin Lasa un comentariu

Teorema sinusurilor

$\frac{AB}{sinC}=\frac{AC}{sinB}=\frac{BC}{sinA}=2R$

Teorema cosinusului

$cos(l_{1},l_{2}})= \frac{ l_{{1}}^{2} + l_{{2}}^{2} - l_{{3}}^{2} } {2\cdot l_{{1}}l_{{2}}}$

$cosA=\frac{ AB^{{2}} + AC^{{2}} - BC^{{2}} }{2\cdot AB\cdot AC }$

$cosB=\frac{ AB^{{2}} + BC^{{2}} - AC^{{2}} }{2\cdot AB\cdot AC }$

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