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P=3,14*(r+10%r)^2=3,14*(1,1r)^2=3,14*1,21*r^2=3,7994r^2
3,7994r^2-3,14*r^2=0,6594r^2
3,14*r^2------100%
0,6594r^2------x%
x=0,6594r^2*100%/3,14*r^2=21%
b) P=3,14*r^2
P=3,14*(2r)^2=3,14*4r^2=12,56*r^2
12,56*r^2-3,14*r^2=9,42*r^2
3,14*r^2----100%
9,42*r^2---x%
x=9,42*r^2*100%/3,14*r^2=300%
gdy r=4 to pole koła równa się 16 Pi
Czyli zwiększy się 4 razy.