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y = x
x - y = 0
a = 1
b = -1
c = 0
r = a.x + b.y - c / √a²+b²
r = 1.1 + -1.0 - 0 / √(1)² + (-1)²
r = 1 / √2
r = √2 / 2
(x - a)² + (y - b)² = r²
(x - 1)² + (y - 0)² = (√2 / 2)²
x² + y² - 2x + 1 = 2/4
x² + y² - 2x + 1 - 1/2 = 0
x² + y² - 2x + 1/2 = 0