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h= wysokość
h=a√3:2
a√3:2+3=a/×2
a√3+6=2a
a√3-2a=-6
a(√3-2)=-6
a=-6:(√3-2)
a=w liczniku:-6(√3+2)=-6√3-12
w mianowniku:(√3-2)(√3+2)=3-4=-1
a=6√3+12
a=6(√3+2)= bok trójkata