1)
a)
[tex]r = \sqrt2cm\\C = 2\pi r\\C = 2\pi*\sqrt2cm=2\sqrt2\pi cm\\S = \pi r^2\\S = \pi * (\sqrt2cm)^2=2\pi cm^2[/tex]
b)
[tex]r = \sqrt3dm\\C = 2\pi *\sqrt3dm = 2\sqrt3\pi dm\\S = \pi * (\sqrt3dm)^2 = 3\pi dm^2[/tex]
c)
[tex]r = \sqrt5 m\\C = 2\pi * \sqrt5m = 2\sqrt5\pi m\\S = \pi * (\sqrt5m)^2=5\pi m^2[/tex]
2.
[tex]\pi = 3,14[/tex]
a)
[tex]C = 2*1.41*3.14cm=8,8548cm\\S = 2*3.14cm^2=6,28cm^2[/tex]
b)
[tex]C=2*1.73*3.14dm=10.8644dm\\S=3*3.14dm^2=9.42dm^2[/tex]
c)
[tex]C=2*2.24*3.14m=14,0672m\\S = 5*3.14m^2=15,7m^2[/tex]
