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This Demonstration illustrates the concept of rotating a 2D polygon. The rotation matrix is displayed for the current angle. The default polygon is a square that you can modify.

Subject:: Geometry
Material Type:: Activity/Lab; Diagram/Illustration; Homework/Assignment; Interactive; Simulation; Teaching/Learning Strategy
Provider:: Wolfram Research
Provider Set:: Wolfram Demonstrations Project
Author:: Mito Are and Valeria Antohe
Date Added:: 09/04/2013

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Inscribed Angles That Intercept the Same Arc

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If two inscribed angles intercept the same arc, then the angles are equal. Drag the orange points to change the figure.

Subject:: Geometry
Material Type:: Activity/Lab; Diagram/Illustration; Homework/Assignment; Interactive; Simulation; Teaching/Learning Strategy
Provider:: Wolfram Research
Provider Set:: Wolfram Demonstrations Project
Author:: Jay Warendorff
Date Added:: 09/04/2013

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Length Scales in the Solar System

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A dynamically simplified solar system is constructed from online data to explore the real solar system on many different scales.

The realistically scaled solar system is surprising because nothing is visible due to the presence of many different scales. That is why it is usually rescaled in animations or illustrations. This is nice but gives us a wrong sense of distances and sizes. This Demonstration is intended to show the solar system's different scales in their full glory.

Since it is hardly possible to see anything when the real scales are used, controls have been added to modify the sizes of the celestial bodies.

Subject:: Astronomy
Material Type:: Activity/Lab; Diagram/Illustration; Homework/Assignment; Interactive; Simulation; Teaching/Learning Strategy
Provider:: Wolfram Research
Provider Set:: Wolfram Demonstrations Project
Author:: Cedric Voisin
Date Added:: 09/04/2013

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Slope and Equations of Lines through Points

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Algebra students need practice determining equations of lines given a pair of points, or the line parallel or perpendicular to a given line through a given point. This Demonstration, along with guiding worksheets or a teacher presentation, gives students a chance to see the relationships between these lines and points.

Subject:: Algebra
Material Type:: Activity/Lab; Diagram/Illustration; Homework/Assignment; Interactive; Simulation; Teaching/Learning Strategy
Provider:: Wolfram Research
Provider Set:: Wolfram Demonstrations Project
Author:: Tom Falcone
Date Added:: 09/04/2013

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