Transcript right angle
Types of Angles Angles form when rays share the same endpoint. This common endpoint is called the vertex. The two sides are rays of the angle. ray ray vertex A Matter of Degrees Angles are measured in degrees. There are 90 degrees (90°) in a square corner like the one shown here. Right Angles You will learn about four different types of angles. The first is a right angle. Right angles measure exactly 90°. The angles at the corners of this rectangle are right angles. Acute Angles Angles that have a measure between 0° and 90° are called acute angles. The angles at the corners of a yield sign are acute angles. They are smaller than right angles. Obtuse Angles Obtuse angles are big. They measure between 90° and 180° The angles formed on the corners of a stop sign are all obtuse angles. Straight Angles Straight angles have a measurement of exactly 180°. A straight angle looks like this: Copyright © 2009 StudyIsland.com All rights reserved.