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25 December 2000 Vol. 5, No. 52 THE MATH FORUM INTERNET NEWS All About Ratios - Lanius | Tessellated Polyhedra - Britton Algebra Help - T2T FAQ ALL ABOUT RATIOS - Cynthia Lanius http://math.rice.edu/~lanius/proportions/ Activities designed to help students understand the concept of ratios, using computers with Internet access. Activities may also be printed out if computer access is not available. Students are expected to: - use multiplication and division of whole numbers to solve problems, including situations involving equivalent ratios and rates; - use ratios to describe proportional situations; - represent ratios and percents with concrete models, fractions, and decimals; - use ratios to make predictions in proportional situations. All About Ratios forms part of Cynthia Lanius' math lessons, which feature subjects as diverse as infinite series, fractals, cartography, dueling pinwheels, a hot tub (interpreting graphs), and more: http://math.rice.edu/~lanius/Lessons/ -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- TESSELLATED POLYHEDRA - Jill Britton http://britton.disted.camosun.bc.ca/jbpolytess.htm Build a durable model of each of the five regular polyhedra (Platonic solids) from a flattened pattern or net. A link to a full-page printable net of each of the regular polyhedra, decorated with its own surface tessellation in full color, is provided. A higher-resolution black-and-white version of each tessellated net will appear in _Polyhedra Pastimes_, by Jill Britton, to be published in March, 2001 by Dale Seymour. The book will be coordinated with Britton's "Polyhedra Pastimes," a page of annotated links to 30 activities on polyhedra chosen from a variety of Web sites: http://britton.disted.camosun.bc.ca/jbpolyhedra.htm Topics include: - regular polygons and tessellations - regular polyhedra and constructions - regular polyhedra nets - Euler's formula - duality and symmetry - history and applications - pyramids and prisms - Golden Ratio - stellations of regular polyhedra - origami star building - tetrahedron kite - polyhedra bubbles - Archimedean solids - polyhedra of M. C. Escher - kaleidocycles - icosahedron globes - geodesics - buckyballs -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- New from the T2T FAQ Math Forum, Teacher2Teacher Service ALGEBRA HELP http://mathforum.org/t2t/faq/faq.algebra.taco From the Math Forum's Teacher2Teacher service, answers to a frequently asked question: How do I help students learn algebra? Suggestions include teaching techniques, archived T2T conversations on the subject, resources from the archives of Ask Dr. Math, books for reference, and links to relevant Web sites. -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- CHECK OUT OUR WEB SITE: The Math Forum http://mathforum.org/ Ask Dr. Math http://mathforum.org/dr.math/ Problems of the Week http://mathforum.org/pow/ Mathematics Library http://mathforum.org/library/ Teacher2Teacher http://mathforum.org/t2t/ Discussion Groups http://mathforum.org/discussions/ Join the Math Forum http://mathforum.org/join.forum.html Send comments to the Math Forum Internet Newsletter editors _o \o_ __| \ / |__ o _ o/ \o/ __|- __/ \__/o \o | o/ o/__/ /\ /| | \ \ / \ / \ /o\ / \ / \ / | / \ / \ |

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