T A Line That Touches A Curve At A Point Without Crossing Over

A line segment on the interior of a circle. A chord has both endpoints on the circle. A diameter is a type of chord
A line segment between two points on the circle or sphere which passes through the center. The word diameter is also also refers to the length of this line segment.

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A line which passes through at least two points of a curve. Note: If the two points are close together, the secant line is nearly the same as a tangent line.
A line that touches a curve at a point without crossing over. Formally, it is a line which intersects a differentiable curve at a point where the slope of the curve equals the slope of the line.Note: A line tangent to a circle is perpendicular to the radius to the point of tangency.

A line which touches a circle or ellipse at just one point. Below, the blue line is a tangent to the circle c. Note the radius to the point of tangency is always perpendicular to the tangent line.

A line segment between the center and a point on the circle or sphere. The word radius also refers to the length of this segment.
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