8cm -20% obwodu
8cm*5-20%*5obwodu
40 cm-100%obwodu
(40-8*2)/2=24/2=12cm
Dluzszy bok ma 12 cm
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8cm -20% obwodu
8cm*5-20%*5obwodu
40 cm-100%obwodu
(40-8*2)/2=24/2=12cm
Dluzszy bok ma 12 cm