This two-minute video animation explains how to measure angles.
An angle is two rays that share a common endpoint. the common point is called the vertex. You can use a protractor to measure angles. Acute angles are less than 90 degrees. Right angle...s are 90 degrees, and obtuse angles are greater than 90 degrees but less than 180 degrees. This video explains this and uses excellent graphics. (02:11)[more]

The students will be guided through the development of the 45-45-90 and 30-60-90 relationships. They will then apply those relationships to specific problems. Dig Deeper will develop their understanding of more difficult problems using the relationsh...ips.[more]

The instructor uses an electronic sketchpad to demonstrate how to constucut angles. Video discusses vocabulary and symbols associated with angles, ray (sides of the angle), vertex (the point where the rays start). It then goes on to use the protrac...tor to measure an angle. It starts with where to put one line of the angle and then where and what to measure. It also instructs students which set of numbers to use on a protractor. Then examples are measured. Good video for instruction and review for any grade level. (06:19)[more]

Students learn the definition of an angle and the concept of measure, including the following vocabulary: side, vertex, protractor, degrees, right angle, acute angle, obtuse angle, and straight angle. (02:26)

The instructor in this video demonstrates that an inscribed angle is half of a central angle that subtends the same arc. The instructor 'writes' using computer software. (14:16)

In this video, students are shown the protractor, what is on the protractor, and how it works. It discusses which numbers to use, the inside numbers or the outside numbers. It depends on which way the angle is facing. Then the narrator goes throug...h some examples. The instrument the narrator uses has movable lines, so students can see how to measure various sized angles. Video is good quality and good for elementary grade students.[more]

In this video, which was originally on TeacherTube, students will learn how to use and read a protractor. Instructor gives a brief review of angles. She uses computer software for the demonstration. (07:52)

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