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wysokość=2/3*podstawa=2/3*6=4dm
p=0,5*6*4=12 dm2
h - wysokość
a = 6dm = 60 cm
h = ⅔ * 60 = 40 cm
P = ½ * a * h
P = ½ * 60 * 40
P = 120 cm²
Odp. Pole jest równe 120cm².