Editing Inscribed angle (section)

===Corollary===
[[Image:Inscribed angle theorem4.svg|thumb|The angle {{mvar|θ}} between a chord and a tangent is half the arc belonging to the chord.]]

By a similar argument, the angle between a [[Chord (geometry)|chord]] and the [[tangent]] line at one of its intersection points equals half of the central angle subtended by the chord.  See also [[Tangent lines to circles]].