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Glossary

Glossary:  Module 5

        All informal definitions are based on

my own experience and knowledge

Term: Reflection Symmetry

         Informal Definition:

One half of the picture looks exactly like the other half

Formal Definition:

A figure that contains a line along which a mirror can be

placed to reflect either half of the figure so it reproduces

the other half.

Definition from:  Mathematics: A Human Endeavor, 3rd Edition

Example of Reflection Symmetry:

Example from: http://www.1stwebdesigner.com

Term: Rotational Symmetry

        Informal Definition:

An object is moved around a middle point so it appears again

Formal Definition:

A figure that can be rotated through an angle of less than 360′

so that it coincides with its original position.

Definition from:  Mathematics: A Human Endeavor, 3rd Edition

Example of Rotational Symmetry:

Example from: http://doyle.webnode.com

Term: Regular Polyhedron

       Informal Definition:

A solid that has same shape and size on each of its faces

Formal Definition:

A solid having faces in the shape of a regular polygon.

All of its faces, edges, and corners are identical.

Definition from: Mathematics: A Human Endeavor, 3rd Edition

Examples of Regular Polyhedrons:

Example from: http://www.math.rutgers.edu

Term: Pyramid

        Informal Definition:

Has a polygon base and triangle sides

Formal Definition:

A pyramid is a polyhedron with a polygonal base

and triangles for its faces.

Definition from: Icoachmath.com

Example of a Pyramid:

Example from: http://www.wiki.superdupergames.org

Term: Prism

        Informal Definition:

Has two same polygon bases and same size rectangle sides

Formal Definition:

A solid with two congruent parallel faces, where any cross

section parallel to those faces is congruent to them.

Definition from: http://www.mathopenref.com

Example of a Prism:

Example from: http://home.comcast.net

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One response to “Glossary

  1. Jennifer,

    The images really make all the difference to understanding. If you weren’t using this blog to create a glossary you could use your entries as part of a math word wall.

    I look forward to seeing what you add next!

    Pat

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