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h=wysokosc=12m
b=krótsza podstawa=20m
a=dłuższa podstawa
a=b+2x
x²+h²=c²
x=√[15²-12²]=√81=9m
a=20+2*9=38m
ilośc siatki=a+b+2c=38+20+2*15=88m
pole=1/2[a+b]h=1/2*(38+20)*12=348m²=3,48 ara bo 1 a=100m²