Question

A circle is centered at the point (1,2) and has the radius of length of 3. what is its equation? here is a picture that might help...

Answer 1

Answer:

the equation of circle is

${(x - 1)}^{2} + {(y - 2)}^{2} = {3}^{2} \\ {x}^{2} + 1 - 2x + {y}^{2} + 4 - 4y = 9 \\ {x}^{2} + {y}^{2} - 2x - 4y - 4 = 0$