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L =
L =
L= 26 * 3,14 = 81,64
P =
P=
P=
P= 169 * 3,14 = 530,66
Pk=pi x r^2
Pk= 3.14 x 13^2 = 3.14 x 169 = 530,66 cm^2
Obwód
obw= 2pi x r
obw= 6,28 x 13 = 81,64 cm