S=ab*sin A sin 30=1/2 ab*sin A=S ab=S/sin30 ab=24 делим на 1/2=48 a=x b=3x x*3x=48 3x^2=48 x^2=48/3 x^2=16 x=4 a=4 b=12 P=2(a+b)=2(4+12)=2*16=32