A tangent intersects a circle at only one point, while a chord intersects the circle at two points. Also, a chord is contained within a circle, but a tangent is outside the circle, except for the point of tangency, which lies on the circle. Hope this helps :)
1. A chord is a ray joining 2 points situated on a given curve.
2. A tangent is a ray that passes through only one point situated on the curve.
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