Math K-Plus

# Obtuse Angle Definition

## What Are The Characteristics Of An Obtuse Angle?

The following are the unique geometric characteristics.
• A angle is created when two rays intersect.
• The intersection of the two rays is called the vertex.
• 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 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 obtuse angle's value.
• Is there a standard way of writing this type of 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 obtuse angle statements in this example are ∠BAC and ∠CAB.
• An obtuse angle is always greater than 90° but less than 180°. In the example below.

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