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zadanie 2
S(a;b)
a) (x-3)^2+(y-(-5))^2=7^2
S(3;-5)
r=7
b) (x-8)^2+(y-(-1))^2=1^2
S(8;-1)
r=1
2. x^2-4x+4-4+y^2-2y+1=0
(x-2)^2+(y-1)^2=4
S(2;1)
(x-2)^2+(y-1)^2=r^2
A=(-3;4)
(-3-2)^2+(4-1)^2=r^2
25+9=r^2
r^2=34
(x-2)^2+(y-1)^2=34