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(x - a)² + (y - b)² = r²
P(1,-3) dan melalui (1,2) :
(x - 1)² + (y - (-3))² = r²
(1 - 1)² + (2 + 3)² = r²
r² = 25
Jawaban :
(x - 1)² + (y + 3)² = 25