Math Playground
Geometry

Tangent & secant lines

A tangent touches once, a secant cuts through twice.

Two ways a line can interact with a circle.

Stretch the radius
r
radius
3.5
diameter
7.0
circumference
21.99
area
38.48

The two

  • Tangent — touches at exactly one point.
  • Secant — cuts through at two points.