Understanding Obtuse Angles | Definition, Visualizations, and Mathematical Notation

obtuse angle

An obtuse angle is a type of angle that measures greater than 90 degrees but less than 180 degrees

An obtuse angle is a type of angle that measures greater than 90 degrees but less than 180 degrees. In other words, it is any angle that is wider or “more open” than a right angle but is still not a straight line.

To visualize an obtuse angle, imagine a clock face. If you draw a line from the center of the clock to any number between 6 and 11, you will create an obtuse angle. For example, if you draw a line from the center of the clock to the number 9, the angle formed at the center is an obtuse angle.

In mathematical notation, an obtuse angle is denoted by a small arc drawn near one of the angles’ vertices. This arc helps identify it as obtuse and differentiate it from other types of angles, such as acute angles (measuring less than 90 degrees) or right angles (measuring exactly 90 degrees).

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