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pusat = (1/2(1+7), 1/2(4-7)) = (4, -3/2)
persamaan lingkarannya :
(x - 4)² + (y + 3/2)² = (√157)²
x² - 8x + 16 + y² +3y + 9/4 = 157
x² + y² - 8x + 3y + 73/4 - 157 = 0
x² + y² - 8x + 3y - 555/4 = 0
4x² + 4y² - 32x + 12y - 555 = 0