Angle whose vertex is inside a circle and whose sides are chords of the circle.
Property
The degree measure of angle CAF below is equal to one-half the measure of the intercepted arc angle.
Example
In the figure below, angle CAF is an interior angle of the circle with centre O.
Therefore: m\(∠\textrm{CAF} = \frac{\textrm{m} \widehat{\textrm{BE}}\space+\space\textrm{m}\widehat{\textrm{CF}}} {2}\)