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2. O=2π*r O=2*3,14*7cm=43,96cm =44cm
3. P=π*r^2 P=3,14*(5m)^2= 78,5 m2
4. P=π*r^2 r=1/2d r=1/2*8cm=4cm P=π*r^2=3,14*(4cm)^2=50,24cm2
5. O=2π*r d=2r O=3,14*10m=31,4m