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ResourceSpotlight
In this activity, students will explore the perpendicular bisector theorem and discover that if a point is on the perpendicular bisector of a segment, then the point is equidistant from the endpoints. This is an introductory activity, where students will need to know how to change between pages, grab and move points, measure lengths, and construct the perpendicular bisector.
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Texas Instruments, Inc.
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ResourceSpotlight
In this activity, students will explore the angle bisector of the angles of a triangle. Students will discover that the angle bisectors are concurrent. The point of concurrency is the incenter. Students should discover the relationship between the type of triangle and the location of the point of concurrency.
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Texas Instruments, Inc.
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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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A discussion of the origins of each of the words.
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Ask Dr. Math
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Gives summaries of the different centers of a triangle: centroid, incenter, circumcenter, and the orthocenter.
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Jim Loy's Mathematics Page
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This interactive site defines a triangle’s centroid, gives interesting facts of a centroid and allows users to manipulate a virtual triangle showing the different positions a centroid can have based on a given triangle.
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Math Open Reference
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This gives descriptions of each point of concurrency and shows the construction of these points includes links to GPS files for interaction.
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An investigation of concurrency
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This interactive site defines a circumcenter of a triangle, gives relevant properties of a circumcenter and allows users to manipulate a virtual triangle showing the different positions a circumcenter can have based on a given triangle.
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Math Open Reference
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A discussion of finding a triangle with centers on lattice points.
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Ask Dr. Math
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