P= pi razy r do kwwadratud=9 czyli r=4,5P=3,14 razy 20,25 = 63,59
P=Π*r2
P=3,14*20,25=63,6
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P= pi razy r do kwwadratu
d=9 czyli r=4,5
P=3,14 razy 20,25 = 63,59
P=Π*r2
P=3,14*20,25=63,6