What is the standard form of the equation of a circle with center (h, k) and radius r?
$$(x + h)^2 + (y + k)^2 = r^2$$
$$x^2 + y^2 - 2hx + 2ky = r^2$$
$$2(x - h)^2 + 2(y - k)^2 = r^2$$
$$(x - h)^2 + (y - k)^2 = r^2$$
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