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3² + (-4)² = 25? 9 + 16 = 25 si pertenece
2) (X - X1)² + (Y - Y1) = R² es la forma de la ecuación canónica de la circunferencia con centro en (X1, Y1) y radio R
(X + 7)² + (Y - 2)² = 11 X² + 14X + 49 + Y² -4Y + 4 = 11
X² + 14X + Y² - 4Y + 42 = 0