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x² + y² - x - 3/4 = 0
x² - x + y² = 3/4
x² - x + 1/4 + (y - 0)² = 3/4 + 1/4
(x - 1/2)² + (y - 0)² = 1
dari bentuk umum lingkaran : (x - a)² + (y - b)² = r²
maka , r² = 1
r = √1
r = 1 satuan panjang