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Learn what an obtuse angle is and how to identify it in different shapes and situations. See examples, diagrams and worksheets to practice and test your knowledge of obtuse angles. Learn what an obtuse angle is, how to identify it, and its properties. See real-life examples of obtuse angles and how to measure them. Explore obtuse angle triangles and their characteristics. Parts of an Angle The corner point of an angle is called the vertex And the two straight sides are called arms The angle is the amount of turn between each arm. How to Label Angles There are two main ways to label angles : 1. give the angle a name, usually a lower-case letter like a or b, or sometimes a Greek letter like α (alpha) or θ (theta) 2. or by the three letters on the shape that define the angle , with the middle letter being where the angle actually is (its vertex). Example angle ... An obtuse angle is an angle that measures greater than 90° but less than 180°. Learn the definition, construction, properties, examples, and more.
