Question 1092431
2pi*r^2+2pi*r
if r=1, then A=2pi+2pi=4pi
if r=3, then A=18pi+6pi=24 pi
6-fold.
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A=s^2
A=(3s)^2=9s^2;  it increases 9-fold
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A=4pi*r^2
A=4pi(1/2*r)^2=p*^r^2, it decreases 75% to 1/4 of the original area.