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Activity: Diagonals of a square - Math Open Reference
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Go to: http://www.mathopenref.com/squarediagonals.html (opens a new window)
Description:

A web page and interactive applet show how to compute the length of the diagonals of a square. A square is shown that can be resized by dragging its vertices. As you drag, the diagonals are continuously recalculated.

Text on the page explains calculation. For those who prefer it, in a formula that is given.

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference interactive geometry reference book project at http://www.mathopenref.com.

Technology Type: Flash 
Author: John Page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Square