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4,2*4=16,8cm
x-------------30%
6*30=100x
180=100x I/100
x=1,8
6-1,8=4,2
30% liczby 6cm = 1.8cm
6cm-1.8cm=4.2cm
Ob₂=4.2cm*4=16.8cm
24cm-16.8cm=7.2cm
Odp: Obwód tego rombu zmniejszy się o 7.2cm