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x=AD
y=DB
z pitagorasa obliczam x
x²=(√13)²-3²
x²=13-9
x²=4
x=2
z pitagorasa obliczam y
y²=5²-3²
y²=25-9
y²=16
y=4
AB=2+4=6
poleΔ=½ah
½×6×3=9j.²