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0,75x-szerokosc
Pprostokata=x*0,75x
12=0,75x*x / *100:75
16=x*x
x=4cm
szrokosc=3cm
przekatna prostokatna to 5cm( z trojkata Egipskiego 3,4,5 to wiem)
r kola=2,5cm
Pkola=Pi*2,5*2,5
P=6,25PIcm2
Ob=2Pir
Ob=5Picm2