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dolan to 4+3=7
bok prostopadly to 4
ramie to 7-2=5
obw= 4+4+7+5= 20
obwod jest rowny 20cm
górna podstawa-4cm
dolna podstawa-4cm+3cm=7cm
2 ramię-7cm-2cm=5cm
Ob=a+b+c+d
Ob=4cm+4cm+7cm+5cm=20cm