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d₂= 12:4= 3cm
P=½*d₁*d₂
P=½*12*3
P=½*36
P=18 cm².
q = 12cm: 4 = 3cm
P= 1/2×p×q
P =1/2 × 12cm × 3cm
P = 18cm²
:)
d2=12/4=3cm
P=d1*d2/2
P=12*3/2=18cm kwadratowych
Odp.Pole rombu wynosi 18 cm kwadratowych.