Number of diagonals in a hexagon explanation
This is video using a computer monitor to show how many diagonals are in a hexagon.  A hexagon has a total of 9 diagonals.

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Tessellation Slideshow of Students Projects
A musical slide show of 7th grade students tessellation projects.  There is a definition at the beginning of the video of tessellation and where you can find tessellation.  The video then shows how the students took a square and moved it into action using three types of tesselations-translation, rotation, and reflection.  (02:45)

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Geometry Rotation
A rotation is an isometric transformation where the original figure and the image are congruent. The orientation of the image also stays the same, unlike reflections. This video demonstrates how to perform a geometry rotation. (6:55)
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Reflections and Rotations
This video teaches rules for reflections and rotations.  Review of symmetry is provided in this clip.

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Bar Graphing 4th Grade
This is a 3 minute story of a student earning money by doing various jobs.  The student puts all the money earned and jobs on a bar graph.  This clip give an overview of bar graphing for 4th grade math.

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Introduction to Frequency Tables
A brief introduction to the use of Frequency Tables.  Definitions of statistics, data, and frequency table are discussed.

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How to Prove Triangles are Similar
Students learn the following theorems related to similar
triangles. If an angle of one triangle is congruent to an angle of
another triangle, and the lengths of the sides that include each angle
are in proportion, then the triangles are similar (Side-Angle-Side
Similarity Theorem, or SAS Similarity Theorem). If the lengths of the
sides of two triangles are in proportion, then the triangles are
similar (Side-Side-Side Similarity Theorem, or SSS Similarity Theor

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How to Find the Perimeter of a Triangle
This is a very brief tutorial that focuses on solving the perimeter of a triangle. The teacher uses a small whiteboard for instruction. (01:51)
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Learn about Perimeter and Area
Learn about Perimeter and Area - The video teaches students how to calculate the perimeter and area of figures. (05:36)
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[French For Kids] What Do They Do? Part 6
This brief video, which focuses on activities,Â has simple sentences spoken by a native speaker in French and the sentences are accompanied by appropriate images. The video, however,Â may be better served if the English translation were present, especially for beginning French learners. It is well-produced with clear sound.
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The History of Valentine's Day
This professional video explores the history and legends surrounding Valentine's Day. The presenter explains the legend of St. Valentine. The end of the video consists of impromptu interviews of customers at a greeting card store.  (03:59)
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Linear Inequalities - A Visual Proof
An instructor shows why we flip the sign when multiplying or dividing by a negative when solving inequalities. Â He uses a flip chart and shows several examples including both inequalities and word problems.
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How to Divide Inequalities
How to Divide Inequalities. Part of the series: Math FractionsÂ and Equations. When dividing inequalities, treat the equation like any other standard equation. Flip the inequality sign when dividing an inequality by a negative number with help from a math author and teacher.
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Graphing Linear Inequalities in Two Variables
This video begins with a simple inequality, then explains how to graph the inequality.Â  The instructor begins by showing how to graph the boundary line, then tells how to show the correct solution set on the graph by shading.Â

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Graphing Systems of Linear Inequalities
InÂ  this video, the instructor goes through the steps needed to graph a system of linear inequalities.Â  He discusses slope, shows how to draw the line on the coordinate plane, and explains what section of the graph should be shaded.Â  There is some shadow on the white board which makes it a little more difficult to see at times during the instruction.

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World War II: Invasion Of Poland - part 5/5
September 1939 - May 1940 The German and Soviet invasions of Poland, the Winter War, the sinking of the Graf Spee and Britain's apathy during the "phony war" until Britain's defeat in its first military engagement with German land forces in Norway, which led to the rise of Winston Churchill. Interviewees include Lord Boothby, Lord Butler, Admiral Charles Woodhouse, Sir Martin Lindsay and Sir John "Jock" Colville.
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Symptoms of Diabetes - Illumistream Health
One-third of diabetics donâ€™t know that they have the condition. This video can help you avoid being one of those undiagnosed. In this video, a doctor explains the risk factors, signs, and symptoms of diabetes.Â  2:55 min.
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Preventing Stroke
Up to 80 percent of strokes that occur in the United States each year could be prevented! In this video, a doctor give practical advice to stroke prevention.Â  3:33 min.
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Music Key Signatures Explained
This is an excellent teaching tool for high school and and advanced musical instumentalist.
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Reading sheet Music Part 1
Scales octaves on a piano. This is a wonderful tool to use for instruction for middle and high school age children.
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