prea usor
a)AC^2=BC^2-AB^2
AC^2=400-256
AC^2=144
AC^2=rad din 144
AC=12 cm
sin C=AB/BC=16/20=4/5
cos C=AC/BC=12/20=3/4
tg B=AC/AB=12/16=3/4
ctg B=AB/AC=16/12=3/4
b)BC^2=AB^2+AC^2
BC^2=6^2+(6 rad din 3)^2
BC^2=144
BC=12 cm
sin B=AC/BC=6 rad 3/12=2 rad 3
cos B=AB/BC=6/12=1/6
tg C=AB/AC=6/6 rad 3= 1 rad 3
ctg= rad 3 pe 1
