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x - pole pierwszego koła
4x - pole drugiego koła
x+4x=45π
5x=45π
x = 9π - pole I
πr²=9π
r²=9
r=3
O=2πr = 6π
4*9π = 36π - pole II
πr²=36π
r²=36
r=6
O=2πr = 12π
12π - 6π = 6π