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oernstoflife.
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Leggenda:
[a]=alfa
[b]=beta
[c]=gamma
s=superficie
Esercizio:
a=115,00m
b=143,00m
[a]=53g,4850
sen[b]=b x sen[a]/a = 143 x sen53,4850/115 = 0,9261
[b]=sin-10,9261 = 75g,3660
[c]=200-(53,485+75,366) = 71g,1490
c=sen[c] x b/sen[b]=sen71,1490 x 143/sen75,3660 = 138,83m
s=0,5ab x sen[c]=0,5 x 115 x 143 x sen71,149 = 7392,25m2.