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b=1,2[m] dl. cienia preta
x dl. wysokosci wiezy
c=31,5[m] dl. cienia wiezy
a/b=x/c
1,6/1,2=x/31,5
1,2x=31,5*1,6
1,2x=50,4/:1,2
x=42[m]
Wysokosc wiezy wynosi 42[m].