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(- 1 - 3)² + (1 - 4)² = r²
(- 4)² + ( - 3)² = r²
16 + 9 = r²
r² = 25
jadi persamaan lingkaran :
(x - 3)² + (y - 4)² = 25
x² - 6x + 9 + y² - 8y + 16 = 25
x² + y² - 6x - 8y + 9 + 16 - 25 = 0
x² + y² - 6x + 8y = 0