Question

(X-2)²+(y-1)²=25 how do you do this problem?

Answer 1

$(x-x_c)^2+(y-y_c)^2=r^2\\ (x_c,y_c) - \text{center}\\\\ (x-2)^2+(y-1)^2=25\\ \text{center}=(2,1)\\ r=\sqrt{25}=5$