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Math K-Plus

# Definition Of Acute Angle

## What Are The Characteristics Of An 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°. _