1 Oblicz pole kola o promieniu 2 cm 2 oblicz dlugosc okregu o promieniu 3 mm 3 oblicz obwod kola osrednicy 5dm

1. P = [latex] pi [/latex]r^2 P = [latex] pi [/latex] (2cm)^2 P = 4 [latex] pi [/latex] cm^2 2. O = 2 [latex] pi [/latex] r O = 2 [latex] pi [/latex] * 3mm O = 6 [latex] pi [/latex] mm  3. l = 5dm r = 2,5dm O = 2 [latex] pi [/latex] r O = 2 [latex] pi [/latex] * 2,5dm O = 5 [latex] pi [/latex] dm