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.

You are watching: A line that touches a curve at a point without crossing over

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.

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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.

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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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