4.MD.7. Recognize angle measure as additive. When an angle is decomposed into nonoverlapping 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
3283 Views:

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...s of Acute triangles as distinguishable from other triangles. Students will use an interactive protractor for practice to correctly measure interior angles to distinguish acute triangles from others.
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June 13, 2012 at 11:14 PM


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Ages: 8  18
3391 Views:

This twominute 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 ...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)
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July 22, 2011 at 02:29 PM


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Ages: 8  12
2227 Views:

Solve problems related to complementary angle concepts.
June 13, 2012 at 11:30 PM


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Ages: 10  14
2170 Views:

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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Ages: 18  18
13440 Views:

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...elationships among angles within
shapes, and generalize a formula for finding the sum of the angles in
any ngon. Use activities based on GeoLogo to explore the differences
among interior, exterior, and central angles.
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March 8, 2010 at 01:19 PM


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Ages: 8  12
1118 Views:

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 (...complementary).
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June 13, 2012 at 11:48 PM


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Ages: 9  12
575 Views:

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
2574 Views:

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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Ages: 6  12
1619 Views:

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...s.
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November 28, 2010 at 07:58 PM
