A *segment* of a circle is the figure contained by a straight line and a circumference of a circle.

An *angle of a segment* is that contained by a straight line and a circumference of a circle.

An *angle in a segment* is the angle which, when a point is taken on the circumference of the segment and straight lines are joined from it to the ends of the straight line which is the base of the segment, is contained by the straight lines so joined.

And, when the straight lines containing the angle cut off a circumference, the angle is said to *stand upon* that circumference.

A line in a circle, such as the line BC, divides the circle into two segments, the small blue segment BDC, and the large yellow segment BEC.
An angle An example of an angle |