An angle is the space between two intersecting lines or rays. Every angle has three key components: the vertex, which is the point where the two rays meet, and the two rays themselves, which are the sides of the angle. Let me show you how an angle is formed by rotating one ray from another.
Angles are formed through the rotation of one ray from another. The amount of rotation determines the size of the angle. Watch as I demonstrate different amounts of rotation creating different angle sizes. Notice that the angle measurement depends only on the amount of turn, not on the length of the rays.
Angles are measured in degrees, with a full rotation equaling 360 degrees. We use a protractor to measure angles accurately. Let me demonstrate how to measure different angles using a protractor. Watch as I show common angle measurements like 30, 45, 60, and 90 degrees.
There are four main types of angles based on their measurements. An acute angle is less than 90 degrees. A right angle is exactly 90 degrees. An obtuse angle is between 90 and 180 degrees. A straight angle is exactly 180 degrees. Let me show you examples of each type.
An angle is a fundamental geometric concept formed when two rays meet at a common point called the vertex. The angle measures the amount of rotation between these two rays.
Angles are measured in degrees or radians. A full rotation is 360 degrees or 2 pi radians. A right angle is 90 degrees, and a straight line represents 180 degrees.
Angles are classified by their measure. Acute angles are less than 90 degrees, right angles are exactly 90 degrees, obtuse angles are between 90 and 180 degrees, straight angles are 180 degrees, and reflex angles are greater than 180 degrees.
Angles are everywhere in our daily lives. We see them in clock hands showing different times, in the slopes of roofs and ramps, when scissors open and close, in the spokes of wheels, and in navigation when we change direction.
Angles can have special relationships with each other. Complementary angles are two angles that add up to 90 degrees. Supplementary angles are two angles that add up to 180 degrees. Watch as I demonstrate these relationships by changing one angle and showing how its complement adjusts automatically.