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Lingkaran.Untuk titik K(5, 0):
x² + y² + Ax + By + C = 0
5² + 0² + 5A + 0B + C = 0
5A + C = -25
Untuk titik L(0, 5):
x² + y² + Ax + By + C = 0
0² + 5² + 0A + 5B + C = 0
5B + C = -25
Untuk titik M(-1, 0):
x² + y² + Ax + By + C = 0
(-1)² + 0² - A + 0B + C = 0
-A + C = -1
5A + C = -25
-A + C = -1
----------------- -
6A = -24 → A = -4
-(-4) + C = -1 → C = -5
5B - 5 = -25 → B = -4
x² + y² + Ax + By + C = 0
x² + y² - 4x - 4y - 5 = 0
x² - 4x + y² - 4y = 5
(x - 2)² + (y - 2)² = 5 + 4 + 4
(x - 2)² + (y - 2)² = 13