Oblicz obwod prostokata o polu 40dm kwadratowych i szerokosci 4 dm.
P=ab
40dm²=4dm*b
b=10dm
O=2a+2b
O=8dm+20dm=28dm
40dm:4dm=10dm
10dm*2+4dm*2=28dm2
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P=ab
40dm²=4dm*b
b=10dm
O=2a+2b
O=8dm+20dm=28dm
40dm:4dm=10dm
10dm*2+4dm*2=28dm2