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P=100 Pi
100 Pi = Pi x r^2
100 Pi = Pi x r^2 | : Pi
100 = r^2
r = 10
d=2r
d=10 x 2
d=20
l = 2 x Pi x r
l = 2 x Pi x 10
l = 20Pi
Resztę zrób na takiej samej zasadzie. :)