tgB=catetea opusa /cateta alaturata
tgB=3/4=AC/AB
AB=4AC/3
cu Pitagora⇒
BC²=AB²+AC²
15²=AC²+16AC²/9
225.9=25AC²
AC=15.3/5
AC=9 cm
AB=4.9/3=12 cm
P=AB+AC+BC=9+12+15=36 cm
sinB=AC/BC=9/15=3/5
cos B=AB/BC=12/15=4/5
tgB=AC/AB=9/12=3/4
ctgB=AB/AC=4/3
daca mai e ceva zi
