4.MD.7. Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.

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Ages: 9 - 14
Acute Triangles (Interactive)
From pbslearningmedia.org, produced by Math Active
First it is established that triangles have sides and are measured by interior angles. They belong to categories based on that. The acute triangle is defined, illustrated and explained. There are many exercises helping students remember the attribute... [more]
June 13, 2012 at 11:14 PM
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Ages: 8 - 18
How to Measure Angles
From brainpop.com, produced by Brainpop
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 angles ... [more]
Found by freealan in 4.MD.C.7
July 22, 2011 at 02:29 PM
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Not Right For WatchKnowLearn
Ages: 10 - 14
Common Angle Measures
From nextvista.org, produced by nextvista.org
This video explains the concept that common angle measures are based on a rotation on a circle.  The video shows a circle with a spinner which is used to show common angle measures such as 180 degrees and 90 degrees.  (04:47)
September 15, 2011 at 07:43 PM
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Not Right For WatchKnowLearn
Ages: 8 - 12
Ahoy! Complementary Angles (Interactive)
From pbs.org, produced by KAET
Solve problems related to complementary angle concepts.
June 13, 2012 at 11:30 PM
Comments: 1
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Ages: 18 - 18
Angle Measurement
From learner.org, produced by learner.org
Review appropriate notation for angle measurement, and describe angles in terms of the amount of turn. Use reasoning to determine the measures of angles in polygons based on the idea that there are 360 degrees in a complete turn. Learn about the r... [more]
Found by tinag1974 in 4.MD.C.7
March 8, 2010 at 01:19 PM
Comments: 1
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Ages: 8 - 12
Angle Hypatia (Interactive)
From pbs.org, produced by KAET
Students are introduced to Hypatia, the Greek mathematician, complementary, supplementary and corresponding angles, and transversal. Students will calculate angle relationships practicing the identification tag of 180 (supplementary) and 90 degrees (... [more]
June 13, 2012 at 11:48 PM
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Not Right For WatchKnowLearn
Ages: 9 - 12
Angles: An Interactive Game
From bbc.co.uk, produced by BBC.Com
In this game, students are given different pairs of dials/angles and must set each dial to the angle shown.  (This link is for an interactive game and may take a few minutes to load.)
June 27, 2012 at 10:25 AM
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Ages: 9 - 15
How to Use a Protractor
From YouTube, produced by davidmpeabody
Learn about what a protractor is, and how to use it to draw angles in this simple instructional video. (02:41)
June 4, 2009 at 12:52 AM
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Not Right For WatchKnowLearn
Ages: 6 - 12
Using Protractors to Measure Angles
From amblesideprimary.com, produced by Mark Robinson
This media asset demonstrates how to use a protractor for measuring angles.  After the introduction, you can select from 10 different online activities for measuring angles.  These activities are designed to be used on whiteboards or computer monitor... [more]
Found by dlwooden in 4.MD.C.7
November 28, 2010 at 07:58 PM
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