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d = r
= |(ax₁ + by₁ + c)/{√(a² + b²)}|
= |(4(-1) + -3(2) - 49)/{√(4² + (-3)²)}|
= |(-4 - 6 -49 )/{√(16 + 9)}|
= |(-59 )/{√(25)}|
= |(-59)/ 5
= 11,8
persamaan lingkaran
= (x - a)² + (y - b)² = r²
= (x - 4)² + (y - (-3))² = (11,8)²
= (x - 4)² + (y + 3)² = 139,24