# Acute Angle, Definition Of Acute Angle

## What Is A Acute Angle?

The following are the unique geometric characteristics of any

**Acute Angle**.

- An angle is created when two rays intersect.
- The intersection of the two rays is called the vertex.
- There is a standard method of labeling angles. First
label the vertex; we choose to label it
**A**. The two Rays are labeled Points**B**and**C**. - The Degree of the 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 B and C**determines the Acute 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 angle statements in this example are**∠BAC**and**∠CAB**. - An acute angle is always less than 90 degrees. In our example below, the Acute Angle is 41°.