P=πr²
πr²=81π/:π
r²=81
r=√81
r=9mm
Ob=2πr
Ob=2*9*π
Ob=18π mm
Pole koła = 81II mm do kwadratu
P= IIrkwadrat
IIrkwadrat= 81 II/: II
r kwadrat= 81/ pierwistkujemy
r= 9
Obw.= 2II*9= 18II mm
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P=πr²
πr²=81π/:π
r²=81
r=√81
r=9mm
Ob=2πr
Ob=2*9*π
Ob=18π mm
Pole koła = 81II mm do kwadratu
P= IIrkwadrat
IIrkwadrat= 81 II/: II
r kwadrat= 81/ pierwistkujemy
r= 9
Obw.= 2II*9= 18II mm