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Maka, persamaannya :
(a - x)² + (b - y)² = r²
Untuk mencari r² = √(3 - 1) + (-1 - 1)
= √ 2 + -2
= 0
maka, (a - x)² + (b - y)² = r²
(1 - x)² + (1 - y)² = 0
Bentuk umum persamaan :
1 - 2x + x² + 1 -2y +y² = 0
x² + y² - 2x - 2y + 2 = 0