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d2= 12.5-2.5=10 cm=1dm
(d1*d2) :2
(1.25*1) :2
0.625 dm2 (kwadratowych)
Pole = 125cm : 2
Pole = 62,5cm²
62,5cm² = 0,625dm²
d₂=12,5cm-2,5cm
d₂=10cm
P=?
P=½d₁×d₂
P=½12,5×10
P=½125
P=62,5cm²
P=6,25dm²