Question

i needed to edit this

Answer 1

\(\bf (x-{\color{brown}{ h}})^2+(y-{\color{blue}{ k}})^2={\color{purple}{ r}}^2

\qquad center\ ({\color{brown}{ h}},{\color{blue}{ k}})\qquad
radius={\color{purple}{ r}}
\\ \quad \\
thus
\\ \quad \\
x^2+y^2=5625\implies (x-{\color{brown}{ 0}})^2+(y-{\color{blue}{ 0}})^2=5625
\\ \quad \\
thus\qquad {\color{purple}{ r}}^2=5625\implies r=?\)

Answer 2

notice the center coordinates, that's where the center of the cirle is at
get the radius, and move left/right/up/down to find the intercepts

the area, well, the Area of a circle is \(\Large \pi r^2\)