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trzeci bok - 5/6 * 12 cm= 10 cm
Ob= 24 cm+10 cm+12 cm= 46 cm
lub
drugi bok - 2*12cm=24 cm
trzeci bok - 5/6 * 24 cm= 20 cm
Ob= 24cm+20cm+12cm=56 cm
b=24 cm
c= 12*5/6= 10 cm
Obw= a+b+c
Obw=12+24+10=46 cm