Question

What is the standard equation of a circle?

(x + h)2 + (y + k)2 = r

(x – h)2 + (y – k)2 = r

(x – h)2 + (y – k)2 = r2

(x + h)2 + (y + k)2 = r2

Answer 1

Hello:
the standard equation of a circle : (x – h)2 + (y – k)2 = r2
ridus : r center A(h , k )