The following are the unique geometric characteristics of any

- An angle is created when two Rays intersect.
- The intersection of the two rays is called the Vertx.
- There is a standard method of labeling any Angle. First
label the vertex; we choose to label it
**A**. The two rays are labeled Points**Z**and**C**. - The Degree of the Right Angle between
two rays is determined by the space between the rays.
See diagram below. One ray is horizontal thus giving us a reference point. The distance
of separation between
**Rays Z and C**determines the angle's value. - Is there a standard way of writing an angle as a mathematical
expression? The answer is yes. Here are the details: (1) All angles must start
with the
**∠**character. (2) The vertex must be the center label when writing an angle. (3) Valid right angle statements in this example are**∠ZAC**and**∠CAZ**. - A Right Angle is exactly 90 degrees. A "half square" symbol, red in the diagram, is how we show a right angle.