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persamaan lingkaran memalui pusat P(a,b)
(x - a)² + (y - b)² = r²
(x + 2)² + (y - 1)² = 5²
x² + 4x + 4 + y² - 2y + 1 = 25
x² + y² + 4x - 2y + 5 = 25
x² + y² + 4x - 2y - 20 = 0