Whistler Alley Mathematics

These are some mathematics investigations I have pursued over the years. They may be of some interest to teachers, students, or hobbyists. I try to convey a conceptual understanding, usually without rigorous proof. Some of the lessons are accompanied by questions and suggestions for extensions.

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Sintético
Suave malla de punto tejida parte superior de tela
Slip en la comodidad deportiva caminando en la parte superior diseño de zapatillas
Air Enfriado espuma de memoria confort acolchado plantilla
suave Explosión sensible Compuesto permite máxima flexibilidad y es extremadamente peso ligero
Flexible suela de tracción con mini redondeado diseño de taco
Some of the lessons are accompanied by questions and suggestions for extensions.

In my pursuit of a teaching career, I was told to justify the study of each concept by establishing its relevance to the students’ lives. Sorry, but I still have trouble buying into that one. Fortunately, poetry and music are rarely put to that same test. As I glance at the list below, I must concede that it would be difficult to convert any of the lessons into food, shelter, or money. These are things that interested me, and now I understand them better. If there is a reward, it is the fact that every time I do this I get better at figuring things out.

I occasionally get email from people seeking permission to use my work. Feel free to cite, quote, edit, reproduce, or distribute anything on this site. Do not worry about putting my name on it, but please do not put your own name on it.

Many of these presentations use the Geometer’s Sketchpad, but only one of them actually requires it. If you do not have the software, let me suggest that you follow this link to Key Curriculum Press and look into it.

Paul Kunkel


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Recent Changes

March 16, 2016

Updated the animations on Hanging With Galileo.

October 23, 2015

Updated the animations on Reuleaux Triangle.

October 9, 2015

Updated the animations on the Vernier Scale page of the Geometry of Surveying.

October 8, 2015

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Updated the animations on Linkages.

October 4, 2015

Updated the animations on On the Square.

September 25, 2015

Updated the animations on Tangent Circles.

September 23, 2015

Updated the lead page of Conic Sections and Construction.
The page it replaced had java animations that were not being treated well by modern browsers. New images were generated with the developmental Web Sketchpad, which is producing very satisfying results. This appears to be the future, so expect more of my pages to be similarly updated soon.

February 26, 2015

Added Book VII to the Conics of Apollonius.
This is the final surviving book of the treatise.

October 22, 2014

Added Book VI to the Conics of Apollonius.

June 10, 2014

Added Book V to the Conics of Apollonius.


 Includes GSP-3 files

 Includes GSP-4 files

 Includes GSP-5 files Contents:

The Brachistochrone

We are given two fixed points in a vertical plane. A particle starts from rest at one of the points and travels to the other under its own weight. Find the path that the particle must follow in order to reach its destination in the briefest time.

This is a famous problem in the calculus of variations. Nothing new is presented here, but the explanation is more thorough than most.


Buffon’s Needle

An old probability exercise is aided by an interactive Sketchpad file. By manipulating the sketch, an intuitive understanding may be gained, even if the student has had no introduction to calculus.


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Chinese Handcuffs This has no lesson, only questions. It is just an interesting animated file, which invites student investigation. It has applications for geometry,

Zapatillas de deporte Skechers Performance Go Walk 4 Exceed con cordones para mujer Taupe / Coral Zapatillas para caminar Propell Mujer Travellite MJ Plata , Walking Cradles Womens Henna Taupe Nubu estampado claro Dr. Comfort Lu Lu Profundidad terapéutica para diabéticos terapéuticos Mujer Velcro de cuero para zapatos Negro Skechers Women s Walk Walk Joy-Invite Sneaker Azul marino / Multi Zapatillas de deporte de cuero de Praga Drew Shoe para mujer Estaño , Zapatillas para caminar Ryka Women s Dash 2 Gris / plata / lima Drew Shoe Athena para mujeres Blanco azul , Zapatillas para caminar ProFit TravelFit Slide para mujer Negro Skechers Women s Go Walk Joy-Paradise Sneaker Azul marino / blanco , Zapatos de mujer RYKA Sky Walking Azul marino / Lila , Zapatillas para caminar Skechers Gostyle 15606 para mujer Rosado Zapato de agua Easy Spirit para mujer First Walker Azul-menta , Zapatillas para caminar Skechers Go s Lite-Blooming Walking para mujer Gris pardo Skechers Women s Walk Walk Lite-15375 Sneaker Gris pardo , Earth Womens Allegro Ballet Flat Gamuza sedosa roja brillante , MOZO Zapatillas para mujer The Maven Sneaker Lunar Rock Zapato para caminar Saucony Mujer Grid Momentum Blanco Drew Shoe Athena para mujeres Crema / Combo , Dr. Comfort Annie-X Mujer diabética terapéutica Doble Profundidad Zapato Lycra Velcro Beige Zapato para caminar con cordones Go Step de Skechers Performance para mujer Gry / Wht Zapatillas para caminar ProCon Zipiv TravelActiv para mujer Plata blanca Atletismo femenino de Apex Blanco / Vinca , Zapatillas para caminar RYKA Women s Devotion Plus Azul marino Zapatillas de entrenamiento WX624v2 para mujer New Balance Blanco Zapatilla deportiva Skechers You-14958 para mujer Blanco negro , Drew Shoe Women s Tulip Comfort Negro , Prop & eacute; t Zapatillas para mujer Wear N Wear Slip on LL Walking Sr White Navy , I-RUNNER Maria Puntera terapéutica para mujer con profundidad extra Calzado de cuero / malla con cordones Gris / Salmón ,
trigonometry, and probability. Fair warning: The discussion revolves about a figure that appears only when the sketch is animated. Without Geometer’s Sketchpad, this one will make little sense at all.


Conic Sections and Construction

My emphasis is on geometric properties of the conic sections, particulary understanding that has been handed down to us in ancient texts. There also are some challenging constructions.


The Geometry of Surveying

This used to be my job, and I enjoyed studying all of the geometrical concepts that were part of the science of land surveying. In this article I discuss the instruments of the profession, their operating principles, their error, and their calibration.


Hanging with Galileo

An investigation into the catenary, the curve formed by a chain suspended at both ends. It also extends into the curve of the main cables on a suspension bridge, which, interestingly, is not a catenary.


Inversion Geometry Chaco Women s Zx2 Classic Athletic Sandal Apex Gray , NIKE Mujeres Air Zoom Pegasus 33 Negro / negro-lava Glow , Zapatillas para correr A7200WX085 de Apex para mujeres Rosado , Zapatillas de entrenamiento de vuelo Jordan Nike para hombre Gimnasio Rojo Negro Gimnasio Rojo , Chaco Yampa Z2 Sandalia para mujer Pixel Weave Under Armour Speedform Velociti para mujeres Rhino Gray / Glacier Grey / Black , Skechers Women s Walk Walk Lite-Daisy Loafer Negro Naot Footwear Mujer Verbena Oily Dune Nubuck / Maple Brown Leather , Zapatillas de running Mizuno Women s Wave Rider 18 Blue Atoll Zapatillas de running Fresh Life Arishi V1 para mujer New Balance Acero / Trueno Zapato de caminar ECHONON LE2 para mujer Saucony Negro Zapatillas para caminar Ryka Women s Devo Plus 2 Negro / púrpura Sanda Verra Teva para mujer Mar de Bering Zapatillas de entrenamiento cruzado PUMA para mujer Fierce Core Puma White-puma Black , Supra Method Skate Shoe Cool Gray / Black-cool Gray Vans Auténtico Port Royale Red True White Sandalia de viaje Via Spiga Women s Porter Ante negro Sandalia UGG Australia Royale Slide para mujer Bebé rosa Skechers para mujeres Reggae Fest-Marlin-Fisherman Open Back Mule Ajuste relajado y espuma de memoria a / C Zapato de agua Natural Mocasines casuales Alpargata Deconstructed de TOMS para mujer Black Heritage Canvas Imagínese la zapatilla Casele de Vince Camuto para mujer Arena clara Salón muy fino Salsa de tango latino Zapatos de baile para Mujeres S1002 2.5 Tacón de Inch + Plegable Paquete de cepillo Cuero negro , Zapatillas de ciclismo Smartodoors con suela de carbono o suela de tpu de nylon para carretera y MTB SD01-MTB-Negro / rojo , Cocos de Matisse Women s Alabama Ankle Bootie Negro , Zapatilla Sanna Donna Hemp Chill para mujer Negro , Mocasín con flecos Hi Back Zip Debra II de SoftMoc para mujer Cobre Bota de mujer Rieker Fee 93 Combinación negra , Zapatilla de UGG Women s Lane Girasol Sneaker de gran tamaño para mujer de Alexander McQueen Medianoche azul / plata , Botín de tobillo de Dallas para mujeres de Naturalizer Negro ,

If you have never studied inversion geometry, you can start here. The elementary concepts are explained. This page is a quick reference for the other lessons that employ inversion geometry.


Linkages

Draw a line segment. Did you use a straightedge? How do you know it was straight?

Java simulations are used to investigate a nineteenth century mechanics problem.


On the Square

The challenge: Given four arbitrary, unique points, A, B, C, and D, construct one line through each point such that the four lines form a square.


Orthocenter What is so significant about the orthocenter of a triangle? Why does it even have a name? This investigation was prepared for a geometry teachers’ workshop. It includes a lesson handout in Word format. This lesson was written for use in a computer lab with the Geometer’s Sketchpad, but with a little editing it should work just as well with Cabri or Cinderella.
The Planimeter

A planimeter is a drafting instrument used to measure area. Its mechanism is quite simple, but understanding why it works is more elusive.


Platonic Solids

Find the inradius, circumradius, dihedral angle, surface area, and volume of all of the Platonic solids. There is also some information about some of their other interesting properties.


Reuleaux Triangle

It is not a circle, but it has constant width. Study the properties of this figure with interactive animated sketches.


Rungs and Vineyards

How is that for a descriptive title? Here are investigations of two interesting visual effects seen from a moving automobile. It includes two interactive perspective drawings, and a discussion of the cylindrical and planar projections used to create them.


The Sliding Triangle

An interesting accidental discovery – Investigate ellipses by tracing triangle transformations.


Table Patterns

Explore geometric patterns formed in a table of modular multiplication. This one requires some elementary knowledge of congruence classes and modular arithmetic.

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Tangent Circles

Three circles are given. How many circles can be constructed tangent to all three? How are they constructed? This lesson includes ten animations covering all of the special cases. Some of them are very complex. A little knowledge of circle inversions would help.


Volume of a Torus Do you already know the volume of a torus? Then humor me. I just figured Zapatillas Gris Sneachers Supersonic Sport Women s Microburst Supersonic Fashion Fashion Sneaker Gris blanco 08f6163 it out, and I got a chance to try out this new graphics software.


Resources


The Geometer’s Sketchpad Workshop

It is plain to see that I am very fond of Sketchpad. This page was created after the release of version 4. The idea is to have a place to exchange ideas with other users, especially those who are using the advanced features. Here are some custom tools and some information on Java Sketchpad.

Para caminar
Sketchpad Gallery These are some of my best sketches. You may find them useful or interesting by themselves.

Geometry Construction Reference

Thirteen elementary straightedge 2095603
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and compass constructions are described and illustrated. The original version, in Word format, can be downloaded and distributed.

Back to Whistler Alley


Last update: March 16, 2016 ... Paul Kunkel whistling@whistleralley.com
For email to reach me, the word geometry must appear in the body of the message.