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b - druga podstawa
h - wysokosc
a = 3cm
b =3,5a = 10,5cm
h = 3cm*2 = 6cm
P = (a+b)*h/2 = (3cm+10,5cm)*6cm/2 = 40,5cm kwadratowego
a=3
b=3,5×3=10,5
h=2×3=6
P=½(3+10,5)6
P=3×13,5
P=40,5 cm²