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Which Lines Are Secants Why?

Elena Rostova • • 6 min read
Which Lines Are Secants Why?

Recall that a line that intersects a circle in exactly one point is called a tangent line

tangent line
In geometry, a tangent is a straight line that touches a curve at one point. At the place where they touch, the line and the curve both have the same slope (they are both "going in the same direction"). For this reason, a tangent line is a good approximation of the curve near that point.
. A line that intersects a circle in two points is called a secant line.

Are Secants lines?

A secant line, also simply called a secant, is a line passing through two points of a curve. ... In geometry, a secant line commonly refers to a line that intersects a circle at exactly two points (Rhoad et al.

What makes a secant line?

A secant line is a straight line joining two points on a function. (See below.) It is also equivalent to the average rate of change, or simply the slope between two points. The average rate of change of a function between two points and the slope between two points are the same thing.

Elena Rostova
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Elena Rostova

Elena Rostova holds a Master's degree in Public Health Journalism. She covers groundbreaking medical research, holistic wellness trends, mental health awareness, and nutritional science.