a) x^2 + y^2 + 8x - 4y + 11 = 0
b) x^2 + y^2 + 2x + 4y + 1 = 0
-2a=8 a=-4
-2b=-4
b=2
a^2+b^2-r^2=c
16+4-r^2=11
r^2=9
r=3
S(-4;2)
-2a=2
a=-1
-2b=4
b=-2
S(-1;-2)
1+4-r^2=1
r=2
dalej
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