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a = -3, b = -4
melalui (1,2)
misal titik A(1,2)
panjang Pusat ke titik = r
AP = √((-3-1)² + (-4-2)²)
= √(16 + 36)
= √52
= 2√13
r = 2√13
r² = 52
persamaan lingkaran :
(x - a)² + (y-b)² = r²
(x+3)² + (y+4)² = 52
x² + 6x + 9 + y² + 8y + 16 = 52
x² + y² + 6x + 8y - 27 = 0 <--
semoga membantu :)
Maka, persamaannya adalah: