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1) 3cm=30mm 1,5cm=15mm
30mm+15mm=45mm DC=45mm
2)30mm x 3= 90mm BC=90mm
3) 30mm+45mm=75mm AB=75mm
Obwód: 45mm+90mm+75mm+30mm=240mm
240mm=24cm
Myślę, że pomogłam ;]