The standard equation of a circle with centre $(h, k)$ and radius $r$ is:
A$x^2 + y^2 = r^2$
B$(x + h)^2 + (y + k)^2 = r^2$
C$(x - h)^2 + (y - k)^2 = r^2$
D$(x - h)(y - k) = r$
Answer & Solution
Correct answer: C. $(x - h)^2 + (y - k)^2 = r^2$
Standard circle equation: $(x - h)^2 + (y - k)^2 = r^2$.
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