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dar bentuk umum : (x - a)² + (y - b)² = r²
(x - 2)²+ (y - (- 3))² = 7²
(x - 2)² + (y + 3)² = 49
x² - 4x + 4 + y² + 6y + 9 = 49
x² + y² - 4x + 6y + 4 + 9 - 49 = 0
x² + y² - 4x + 6y - 36 = 0
7² = (x-2)² + (y+3)²
49 = x² - 4x + 4 + y² +6y +9
49 = x²+y² - 4x + 6y+13
persamaan lingkaran = x² + y² - 4x + 6y +13 - 49
=x² + y² - 4x + 6y -36