Geometry

=Geometry=

Tessellation
A repetitive pattern of polygons that covers a plane with no gaps and no overlaps

Links:
http://mathforum.org/sum95/suzanne/whattess.html [|Virtual Geoboard] [|Virtual Shape Making Geoboard] [|Making Tessellations] [|Rotations]
 * http://www.tessellations.org/index.htm**

Vocabulary by Logan C. (2/14/08)

 * Transformation**-a movement of a figure to a new position along a straight line.
 * Reflection**-a movement of a figure to a new position by flipping it over a line.
 * Tessellation**- a repeating pattern of closed figures that covers a surface with no gaps or overlaps.
 * Translation**-a movement of a figure to a new position along a straight line.
 * Rotation**-a movement of a new position by turning it around a vertex or point of rotation.

Polygon Song
media type="youtube" key="lfP4dW3cXmc&rel=1" height="355" width="425"

Types of Triangles - Definitions by Jake H. (2/14/08)

 * //classified by sides://**
 * Equilateral triangle**-a triangle with three congruent sides. (photo example by Dana W. and Sarah R.)
 * Scalene triangle**-a triangle with no congruent sides. (photo example by Dana W. and Sarah R.)
 * Isosceles triangle**-a triangle with two equal sides. (photo example by Amber K. and Courtney S.)

//**classified by angles:**//
 * Acute triangle**-a triangle with three acute angles.
 * Obtuse triangle**-a triangle with one obtuse angle in it.
 * Right triangle**-a triangle with a right angle in it.

Types of Quadrilaterals by Katlyn C. (2/14/08)

 * trapezoid** - exactly 1 pair of parallel sides (photo example by Devin D. and Angelo A.)
 * general quadrilaterals** - 4 sides and 4 angles
 * parallelogram** - 2 pairs of congruent sides and 2 pairs of parallel sides
 * rectangle** - 2 pairs of congruent sides and 4 angles
 * rhombus -** 4 congruent sides and 2 pairs of congruent angles
 * square** - 4 congruent sides and 4 right angles