Question

equação de circunferência (2,7) e raio 5

Answer 1

$(2,7)~r=5\\\\\\ (x-x_{'})^2+(y-y_{'})^2=r^2\\\\\\ (x-2)^2+(y-7)^2=5^2\to\\\\ \boxed{(x-2)^2+(y-7)^2=25}$