### Volume 4, Number 21

 ``` 24 May 1999 Vol. 4, No. 21 THE MATH FORUM INTERNET NEWS Kunkel's Math Lessons | Field Guide to Functions - OSU |Calendars - Math Library KUNKEL'S MATHEMATICS LESSONS - Paul Kunkel http://www.nas.com/~kunkel/math.htm Kunkel's Geometer's Sketchpad lessons aim to convey a conceptual understanding, usually without rigorous proof, with questions and suggestions for extensions. They include: - Buffon's Needle - an old probability exercise - Chinese Handcuffs - questions with applications for geometry, trigonometry, and probability - Hanging with Galileo - an investigation into the catenary - Reuleaux Triangle - a figure that is not a circle, but has constant width - Rungs and Vineyards - visual effects seen from a moving automobile - Sketchpad Ellipses - investigating ellipses by tracing triangle transformations An annotated gallery of sketches, without commentary, for Physics, Calculus, and other miscellaneous topics is also provided: http://www.nas.com/~kunkel/gallery/gallery.htm Lessons without GSP sketches include: - Dodecahedron Measures - dihedral angle and volume - Planimeter - a drafting instrument used to measure area - Table Patterns - modular multiplication - Volume of a Torus - with a virtual reality drawing -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- FIELD GUIDE TO FUNCTIONS - Oregon State University (OSU) http://iq.orst.edu/cq/w99/osu_1/FieldGuide/ A review and reference for the functions commonly encountered in single-variable calculus, discussing the significance, basic notation, and properties of each function. Examples of calculations are on following pages, with exercises for each topic: linear, polynomial, power, rational, exponential, logarithmic, trigonometric, and piecewise functions. Also included are algebraic operations on functions, function composition, and general types of functions. This field guide is designed to support William A. Bogley and Robby Robson's CalculusQuest, the first in a standard sequence of University of Oregon calculus courses: http://iq.orst.edu/cq/ -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- CALENDARS - Internet Mathematics Library http://mathforum.org/library/topics/cals_dates_time/ Browse the Math Forum's collection of sites on calendars, dates, and time, to find lesson plans and articles on calendars from around the world. Highlights include: - The Aztec Calendar - Rene Voorburg http://www.azteccalendar.com/ historical information and illustrations of the two independent systems comprising the Aztec calendar - Calendar Quirks - Ivars Peterson (MathTrek) http://www.maa.org/mathland/mathtrek_12_21_98.html an article about our efforts to create frameworks that allow us to reckon time over extended periods - Calendars - L. E. Doggett http://astro.nmsu.edu/~lhuber/leaphist.html an introduction to calendars: what they are; astronomical bases of calendars; calendar reform and accuracy; historical eras and chronology; and more - Day Of The Week Of Any Date - Jim Loy http://www.mcn.net/~jimloy/day-week.html how to figure the day of the week for any date - The Maya Calendar http://www.astro.uva.nl/~michielb/maya/calendar.html -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- 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\ / \ / \ / | / \ / \ ```