Angles and it's Types
Types of Angles Based on Measurement The space formed when two rays meet each other at a common point is called an angle. Angles can be classified both on their measurement and the way they are rotated. Based on the measurement, angles are classified as follows. Observe the following figure to relate to the different kinds of angles explained below. Acute Angle Any angle that is less than 90° is an acute angle. If two rays intersect at a vertex, forming an angle that is less than 90°, an acute angle is formed. Some examples of acute angle are 20°,30°,45°,60°. Observe the figure which shows that ∠XYZ is an acute angle. Right Angle If the angle formed between two rays is exactly 90° then it is called a right angle or a 90° angle. Observe the figure which shows that ∠AOB s a right angle or a 90° angle. Obtuse Angle Any angle that is greater than 90° but less than 180° is an obtuse angle. The angle formed by the rays PQ and QR in the figure is an obtuse angle. Some examples of obtuse angle