Question

Help me solve this problem please

Answer 1

Center-radius equation of a circle with a center at (5,3) and radius 5 is:
(x−5)^2+(y−3)^2=25

Standard equation of a circle with a center at (5,3) and radius 5 is:
x^2-10x+y^2−6y+9=0

Answer 2

I think you count the squares in the middle or radius ?