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melalui (4,1) --> x=4, y = 1
pers Lingk : (x-a)²+(y-b)² = r²
(4-1)²+(1-(-3))² =r²
3²+ 4² = r²
9 + 16 = r²
25 = r²
pers : (x-1)²+(y-(-3))² = 25
(x-1)² + (y+3)² = 25
titik (6,m) berada pd lingkaran --> x=6, y = m
(6-1)²+(m+3)² = 25
25 + (m+3)² = 25
(m+3)² = 0
m+3 = 0
m = -3