radix

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Benutzernameradix
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 #2
avatar+14538 
+5

Hallo Anonymous,

mit dem Kosinussatz kannst du zunächst nichts berechnen:

gegeben:   Alpha = 68°  ;  Gamma = 82°   =>  Beta = 180° - 68° - 82° = 30°

                   a = 6,3      alle Seitenlängen in  cm

Sinussatz:   $${\frac{{\mathtt{b}}}{{\mathtt{a}}}} = {\frac{\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{\beta}}\right)}}{\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{\alpha}}\right)}}}$$         =>  b =      $${\frac{{\mathtt{6.3}}{\mathtt{\,\times\,}}\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{30}}^\circ\right)}}{\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{68}}^\circ\right)}}} = {\mathtt{3.397\: \!384\: \!439\: \!433\: \!608\: \!8}}$$ 

 

Sinussatz:  $${\frac{{\mathtt{c}}}{{\mathtt{a}}}} = {\frac{\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{\gamma}}\right)}}{\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{\alpha}}\right)}}}$$          =>    c =   $${\frac{{\mathtt{6.3}}{\mathtt{\,\times\,}}\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{82}}^\circ\right)}}{\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}{\left({\mathtt{68}}^\circ\right)}}} = {\mathtt{6.728\: \!642\: \!655\: \!224\: \!084\: \!2}}$$

 

Seite  b mit dem Kosinussatz:  b² = a²+c²-2*a*c*cos (Beta)

b= $${\sqrt{{{\mathtt{6.3}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{{\mathtt{6.728\: \!6}}}^{{\mathtt{2}}}{\mathtt{\,-\,}}{\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{6.3}}{\mathtt{\,\times\,}}{\mathtt{6.728\: \!6}}{\mathtt{\,\times\,}}\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{cos}}{\left({\mathtt{30}}^\circ\right)}}} = {\mathtt{3.397\: \!368\: \!460\: \!742\: \!390\: \!2}}$$

 

Mit dem Sinusatz bekommst du die Ergebnisse einfacher !

Gruß radix !

17.11.2014