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wzor na P1=3a²√3/2
18√3=3a²√3/2 /·2
36√3=3a²√3 /:3√3
a²=12
a=√12=2√3
Δ rownoboczny ma P2=18√3 cm²
wzor na P2=x²√3/4
x²√3/4=18√3 /·4
x²√3=72√3 /:√3
x²=72
x=√72=6√2
zatem x/a=6√2/2√3=3√2/√3=3√2·√3/3=√6/1