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P=a²√3/4
a=?
h=a√3/2
a=2h/√3
a=2√3h/3
a=2√3*4/3
a=8√3/3
P=(8√3/3)²√3/4
P=64*3*√3/(4*9)
P=16√3/3 dm² pole trójkata
a'/a =k=3 skala podobieństwa
P'/P=k² =3² =9 stosunek pól to kwadrat skali podobieństwa
P'=P*k²
P'=16√3*9/3
P'=48√3 dm² pole trójkata podobnego