Volume 3, Number 52
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28 December 1998 Vol. 3, No. 52
THE MATH FORUM INTERNET NEWS
Patterns/Symmetry - Britton | Projective Geometry | USDA-NASS Kids Page
INVESTIGATING PATTERNS: SYMMETRY AND TESSELLATIONS
- Jill Britton
http://britton.disted.camosun.bc.ca/jbsymteslk.htm
Annotated links to 30 activities at a variety of Web
sites, coordinated with Exploring Pattern: Symmetry and
Tessellations, a book by Jill Britton to be published
in March 1999 by Cuisenaire/Dale Seymour.
Britton has assembled links to resources that illustrate
symmetry in wheel covers, paper dolls, butterflies,
traffic signs, beehives, quilts, the alphabet, hex signs,
cast iron decorative work, snowflakes, the Alhambra, and
more. Topics include:
- introduction to symmetry
- symmetry in the alphabet, flags, and quilt blocks
- reflectional and rotational symmetry
- strip patterns
- regular and irregular polygons
- paper-folding and cutting
- origami
- tessellation in nature
- kaleidoscopes
- regular, semiregular, and demiregular tessellations
- Islamic tessellations
- M. C. Escher
- jigsaw puzzles
- tessellating art
- explorations with TesselMania
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PROJECTIVE GEOMETRY - Nick Thomas
http://www.anth.org.uk/NCT/
Projective geometry regards parallel lines as meeting in an
ideal point at infinity, and is concerned with incidences:
where elements such as lines, planes, and points either
coincide or not. For example, Desargues' Theorem says that
if corresponding sides of two triangles meet in three points
lying on a straight line, then corresponding vertices lie
on three concurrent lines. The converse is also true: if
corresponding vertices lie on concurrent lines, then
corresponding sides meet in collinear points.
This handsome site provides some basics; information about
and illustrations of path curves, counter space, and pivot
transforms; short biographies of some people involved
in the development of projective geometry; and references.
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USDA-NASS KIDS PAGE
National Agricultural Statistics Service,
U.S. Department of Agriculture
http://www.usda.gov/nass/nasskids/kidpg.htm
Stanley Stat and Pie-Chart Pam introduce elementary and
middle school students to statistics, and demonstrate how
important they are to agriculture. The site is organized
into:
- history of agricultural statistics and NASS
- games, including jokes and a coloring book
- What does NASS do in your state?
- Words We Use, a short glossary
- cool links on agriculture
Kids may e-mail questions about agricultural statistics
to the site:
http://www.usda.gov/nass/nasskids/other/feedback.htm
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