Question

what is the equation for a circle

Answer 1

Answer:

$2\pi \: r {}^{2}$

Step-by-step explanation:

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Answer 2

Answer:

The general form : x2 + y2 + Dx + Ey + F = 0, where D, E, F are constants. If the equation of a circle is in the standard form, we can easily identify the center of the circle, (h, k), and the radius, r