Review of Tessellations

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Review of Tessellations
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The definition of a tessellation

• The word "tessellate" is derived from the Ionic
  version of the Greek word "tesseres," which in
  English means "four." The first tilings were made
  from square tiles.

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A regular tessellation means a tessellation
made up of congruent regular polygons.
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You can easily figure out the angle measures of a
regular polygon
because you know that the interior angles around
a vertex must be 360 degrees
90909090360
and each interior angle of a regular polygon is
congruent!
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Did you know
There are 4 types of symmetry used to create
tessellations.
A pattern is symmetric if there is at least one
symmetry (rotation, translation, reflection,
glide reflection)that leaves the pattern
unchanged.
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Rotation
To rotate an object means to turn it around.
Every rotation has a center and an angle.
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Translation
To translate an object means to move it without
rotating or reflecting it. Every translation has
a direction and a distance.
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Reflection
To reflect an object means to produce its mirror
image. Every reflection has a mirror line. A
reflection of an "R" is a backwards "R".
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Glide Reflection
A glide reflection combines a reflection with a
translation along the direction of the mirror
line. Glide reflections are the only type of
symmetry that involve more than one step.
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Tessellations are everywhere in the world!
The work of M.C. Escher is a great example Of how
tessellations can appear in art.
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Click here to take the quiz.
Click on the following link for more Information
about tessellations.
http//mathforum.org/sum95/suzanne/tess.intro.html