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(y-b)²+(x-a)²=r²
(5-1)²+(7-3)²=r²
4²+4²=r²
r² = 32
shingga pers.mjd
(y-1)²+(x-3)²=32
y²-2y+1+x²-6x+9=32
y²+x²-2y-6x-22=0