** Chord vs Secant vs Tangent **

Chord, secant, and tangent are lines intersecting curved lines. These are basic geometric constructs with interesting mathematical properties.

**What is a Chord?**

In a plane (2D Geometry), a line segment joining two points on a curve is called a chord. The term is often used to describe a line segment with its ends lying on the circumference of a circle. But it can also describe line segments drawn on ellipses and conic sections.

Among many others, chords of a circle exhibits following properties:

- If the lengths of two chords on the same circle are equal, the chords are lying at the same distant from the center.
- Diameter is a chord which is passing through the center, and it is the chord with the maximum length.
- If two angles are inscribed on the same chord and on opposite sides of the chord, then inscribed angles are supplemental.

**What is a Secant?**

A secant line is a line passing through two points of a curved line. Sometimes it is simply called a “secant”. However, in common usage, it refers to a line passing through two points of a circle. A chord can be considered as an interval on a secant line.

**What is a Tangent?**

A tangent line is a line that just touches a plane curve. Tangent can be considered as a special case of a secant line, where the two points on the curve are infinitely close (or overlap). Tangent has interesting properties and uses in mathematics.

**What is the difference between Chord, Tangent and Secant?**

• A chord is a line segment and both secant and tangents are straight lines.

• Chord is a line segment with the end points lying on a curve while a secant is a line passing through exact two points on a curve.

• A tangent is a line that just touches and passes through a point on a curve. It is a special case of secant where the two points on the curve overlap.

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