Equation of a circle. A circle is the set of all points in a plane at a given distance (called the radius ) from a given point (called the
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Equation of a circle from the graph | Precalculus | Khan Academy in English. Watch later. Share. Copy link.
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1.Find the coordinates of the center point of the circle. For this example, imagine a center at the point (3, 4), whose x-coordinate is 3 and whose y-coordinate is 4.
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