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1 bok= 5 i 3/10 dm
2 bok= ?
obw= 2* 1 bok + 2 * 2 bok
20 dm= * 5 i 3/10 + 2 * 2 bok
20 dm = 10,6 +2*2 bok
9,7 dm= 2* 2 bok
2 bok= 4 i 7/10 dm
odp: drugi bok ma i 7/10 dm
licze na naj ;)
20 dm - 10 6/10 dm = 9 4/10 cm
9 4/10 dm : 2 = 94/10 dm * 1/2 = 47/10 dm = 4 7/10 dm
odp. Drugi bok ma długość 4 7/10 dm.