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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
y-drugi kawałek podstawy
x²=5²-3²
x²=25-9
x²=16
x=4
y²=(√13)²-3²
y²=13-9
y²=4
y=2
podstawa=4+2=6cm
pole Δ=½×6×3=9cm²