Respostas

2014-09-03T20:20:34-03:00
2² + (-3)² = R²
4+9 = R²
R² = 13

(x - 2)² + (y + 3)² = 13
x² - 4x + 4 + y² + 6y + 9 = 13

x² + y² - 4x + 6y = 0