Odpowiedź :
a)
x²+y²-10x-4y+25=0
x²-10x+25+y²-4y+4-4=0
(x-5)²+(y-2)²=4
(x-5)²+(y-2)²=2²
S(5;2)
r=2
b)
x²+y²-4x+2y+4=0
x²-4x+4+y²+2y+1-1=0
(x-2)²+(y+1)²=1
(x-2)²+(y+1)²=1²
S(2;-1)
r=1
a)
x²+y²-10x-4y+25=0
x²-10x+25+y²-4y+4-4=0
(x-5)²+(y-2)²=4
(x-5)²+(y-2)²=2²
S(5;2)
r=2
b)
x²+y²-4x+2y+4=0
x²-4x+4+y²+2y+1-1=0
(x-2)²+(y+1)²=1
(x-2)²+(y+1)²=1²
S(2;-1)
r=1