Oblicz pole i obwód koła , którego promień jest równy : a. 1cm b.2/4 m c. 2,2 dm d 5 całych i 1/3

a) [latex]P=pi r^{2} = pi 1= pi [cm^{2}] \ L = 2 pi r = 2 pi [cm][/latex]   b) [latex]P=pi r^{2} = pi cdot (frac{1}{2})^{2} = frac{1}{4} pi [m^{2}]\ L = 2 pi r = 2cdot frac{1}{2} pi = pi [m][/latex]   c) [latex]P=pi r^{2} = pi cdot (frac{11}{5})^{2} = frac{121}{25} pi = 4frac{21}{25} pi [dm^{2}]\ L = 2 pi r = 2cdot frac{11}{5} pi =4,4 pi [dm][/latex]   d) [latex]P=pi r^{2} = pi cdot (frac{16}{3})^{2} = frac{256}{9} pi = 28frac{4}{9} pi [j^{2}]\ L = 2 pi r = 2cdot frac{16}{3} pi =10 frac{2}{3} pi [j][/latex]  

a. P=1/2Tr^2 (T -liczba Pi)    P=1/2T    O=2Tr=2T b. P=1/2T*2/4^2= 1,2T*1/4=1/8T    O=2T*2/4=T c. P=1/2T* 5 1/3= 1/2T*16/3=16/6 T=2 2/3 T     o=2T*5 1/3=2T*16/3=32/3T=10 2/3T