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a)
c = 2*pi *r =2*8*pi = 16*pi = około 50,24 (cm)
b)
c1 = 24*c = 24 *16*pi = 384 *pi = około 1205,76 ( cm)
c)
kwadrans = 15 min = 0,25 h
c2 = 0,25 *c = 0,25 * 16*pi =4*pi = około 12,56 (cm)
d)
45 min = 0,75 h
c4 = 0,75 *c = 0,75 *16*pi = 12*pi = około 37,68 ( cm)