Math Challenges

Solution:
\( \displaylines{\text{Radius is found using }\sqrt{\left(2-\left(-2\right)\right)^2+\left(1-4\right)^2}=\sqrt{4^2+\left(-3\right)^2}=\sqrt{16+9}=\sqrt{25}=5\\ \left(x+2\right)^2+\left(y-4\right)^2=25} \)