<P> A chord of a circle is a straight line segment whose endpoints both lie on the circle . A secant line, or just secant, is the infinite line extension of a chord . More generally, a chord is a line segment joining two points on any curve, for instance an ellipse . A chord that passes through a circle's center point is the circle's diameter . Every diameter is a chord, but not every chord is a diameter . </P> <P> The word chord is from the Latin chorda meaning bowstring . </P>

Difference between secant and chord of a circle
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