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alfa=60
zd2a =6o
3a=180' a=60'
3y+30'=180' ; 3y=150' y=50'
11x=-6 x=-6:11
6B=150' B=150':6 B=25'
3a=180/:3
a=60
2.3a=180/:3
a=60
3.y+y+y=180-60+30
3y=150/:3
y=50
4.6x+5x=1-7
11x=6/:11
x=6/11
5.6B=150/:6
B=25