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a=9cm
b=12cm
skala k=3
a₁/a=k
a₁/9=3
a₁=9·3=27cm
b₁/b=k
b₁/12=3
b₁=12·3=36cm
odp :boki prostokta podobnego w skali k=3 maja dlugosc 27cm i 36cm