# Graph a circle with center and radius calculator

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If the radius and central angle of a chord are known, then the length of a chord is given by, Length of a chord = 2 × r × sine (C/2) = 2r sine (C/2) Where r = the radius of the circle. C = the angle subtended at the center by the chord. d = the perpendicular distance from the center of a circle to the chord.