1.
[tex]sin \: c = \frac{ab}{bc} = \frac{20}{25} = \frac{4}{5} \\ cos \: c = \frac{bc}{ab} = \frac{25}{20} = \frac{4}{5 } \\ tg \: c = \frac{ab}{ac } \\ ac = 15 \\ tg \: c = \frac{20}{15} = \frac{4}{3} \\ ctg \: c = \frac{ac}{ab} = \frac{15}{20} = \frac{3}{4} [/tex]
2.sin N= MP/PN=9/15=3/5
PN=15
Cos N= PN/MP=15/9=5/3
tg N=MP/MN=9/12=3/4
ctg N=MN/MP=12/9=4/3
/ înseamnă linie de fracție
