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3+2x=6; 2x=3/:2 ; x=1,5;
tg30°=h/1,5;
√3/3=h/1,5 ; 3h=1,5√3/:3 ; h=0,5√3 ;
P=1/2(6+3)×0,5√3=1/2×9×0,5√3=4,5√3/2=2,25√3j.²;