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melalui (4,1) maka:
(4 - 1)² + (1 + 3)² = r²
9 + 16 = r²
r = √25 = 5
sehingga:
(x - 1)² + (y + 3)² = 25
substitusi (6,m) maka:
(6 - 1)² + (m + 3)² = 25
25 + (m + 3)² = 25
(m + 3)² = 0
m = - 3
Jawaban: B