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(3-(-4))² + (6-2)² = r²
(7)² + (4)² = r²
49 + 16 = r²
r² = 65
persamaan lingkaran:
(x + 4)² + (y-2)² = 65
x² + 8x +16 + y² - 4y + 4 = 65
x² + y² + 8x - 4y - 45= 0