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HL Congruent Triangles

(Complete Item Description)

Abstract:: An interactive applet and associated web page that shows how right triangles that have the hypotenuse and one other leg the same length must be congruent. The applet shows two right triangles, one of which can be reshaped by dragging any vertex. The other changes to remain congruent to it, and the hypotenuse and leg are outlined in bold to show they are the same measure and are the elements being used to prove congruence. The web page describes all this and has links to other related pages. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Subject:: Mathematics and Statistics
Grade Level:: Secondary
Collection:: Math Open Reference

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Science of NFL Football: Pythagorean Theorem

(Complete Item Description)

Abstract:: NBC's Lester Holts explores the path a defender must take in order to tackle a ball carrier, and how this distance — called the "angle of pursuit" — can be calculated by using the Pythagorean Theorem to find the hypotenuse of a right triangle, and the distance of a defender's angle of pursuit. "Science of NFL Football" is a 10-part video series funded by the National Science Foundation and produced in partnership with the National Football League.

Subject:: Mathematics and Statistics, Science and Technology
Grade Level:: Secondary
Collection:: NBC Learn

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Triangle

(Complete Item Description)

Abstract:: An interactive applet and associated web page that introduce the concept of a triangle. The applet shows a triangle where the user can drag the vertices to reshape it. As it is being dragged a base and altitude are shown continuously changing. Demonstrates that the altitude may require the base to be extended. The text on the page lists the properties of a triangle and lists the various triangle types, with links to a definition of each. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Subject:: Mathematics and Statistics
Grade Level:: Primary, Secondary
Collection:: Math Open Reference

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