Reflex Angles
- Author:
- Mark Brouwer
- Topic:
- Angles
Any angle that measures greater than 180° is call a Reflex Angle
Every angle has a reflex angle. The sum of an angle and its reflex angle make a full circle, or 360°.
Greek letters are used as variable for angle measurements.
The most commonly used Greek letters used for angle measures are the following:
(alpha), (beta), (gamma), (delta)
By convention, we name and measure angles, especially angles within a circle, counterclockwise.
The direction, counterclockwise (or anti-clockwise), is generally "leftward" around the vertex.
For example: If point X was at the 12 on a clock and point Y was on the 3 on a clock and point W was at the center of the clock, then YWX would measure 90° and reflex XWY would measure 270°
Reflex Angle: use the figure to answer the questions below
1. Reflex Angles
If = 57° what is ?
2. Reflex Angles
If reflex angle, CAB measures 221°, what is the mBAC?