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(2 - 4)² + (6 - 3)² = r²
(-2)² + (3)² = r²
4 + 9 = r²
13 = r²
persamaan lingkaran :
(x - a)² + (y - b)² = r²
(x - 4)² + (y - 3)² = 13
x² - 8x + 16 + y² - 6y + 9 - 13 = 0
x² + y² - 8x - 6y + 12 = 0