Angles

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Definition and properties of the inscribed angle of a circle

Definition and properties of vertical (or opposite) angles

Definition and properties of supplementary angles - two angles that add to 180 degrees

Definition and properties of the interior angles of a transversal

Definition and properties of the exterior angles of a transversal

Definition of a straight angle. An angle that exactly 180 degrees - a straight line.

Definition of an right angle (one whose measure is exactly 90 degrees).

Definition of a reflex angle (one whose measure is greater than 180 degrees but less than 360 degrees).

Definition of an obtuse angle. An angle between (but not including) 90deg and 180 deg;

Defines what is meant by 'interior of an angle'

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