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2 boki maja po 6 cm i 2 po 5 cm
pole = jeden bok razy drugi czyli
pole = 6*5 czyli 30 cm kwadratowych
1 dm = 10 cm
2,2 dm = 22cm
(jeden bok)X = 5cm
(drugi bok) X+1 = 5cm+1 cm = 6cm
Ob= 2×X + 2(X+1) =
2X + 2X + 2 =
4X= 22-2
4X =20 / 4
X= 5cm
P= 5cm × 6cm = 30cm²