The following are the unique characteristics of any

- An straight angle is created with two ray.
- There is a standard method of labeling angles. The
one
**Ray**is labeled Points**A****B**, and**B**and**C**. - Is there a standard way of writing an straight angle as a
mathematical expression? The answer is yes. Here are the details: (1) All angles
must start with the
**∠**character. (2) Valid straight angle statements in this example are**∠ABC**and**∠CBA**. - A straight angle is exactly 180°. (Degree)

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