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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Textil / sintético
Importado
Caucho único
Peso: 6.5 onzas (tamaño 7); natural; gota: 9 mm (talón: 25.5 mm / antepié: 16.5 mm)
Boost's retorno de la energía propiedades mantener cada paso cargado con un sinfín suministro de luz, energía rápida
Stretch suela de goma de la web es liviano y elástico, adaptando a la tierra para estabilidad y trabajo estratégicamente a optimizar el único propiedades de impulso desde touchdown para empujar
Transpirable malla superior con todo el gráfico impresión inspirada por pruebas aramis; calcetín de construcción para un ajuste perfecto
soldada oferta de superposiciones apoyo y estabilidad; extraíble moldeado plantilla para una ajuste anatómico; arco flotante debajo del mediopié para un calcetín sensación; para la máxima comodidad
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,

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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 Zapatillas para correr Saucony Women s Cohesion 10 Gris / menta Sandalia para mujer Terrell Ari Wrap de Merrell Helecho Zapatillas para correr Zante V3 para mujer New Balance Poisonberry / Dark Mulberry Sandalias Therafit Summer Women s Slingback Sport - para fascitis plantar / dolor en el pie Rosado , Zapatillas de running Wave Sayonara 3 para mujer de Mizuno Malibu Azul / Rosa , Zapatillas de running para exteriores adidas outdoor Terrex Tracerocker W para mujer Aero Blue / Trace Purple / Semi Frozen Yellow Merrell Women s Mqm Flex Gris negro Zapatillas ligeras para correr NIKE Womens Air Max Thea Print Trainer Gamma Blue / White / Rio Teal Zapatillas de running NIKE Air Max Thea Ultra FK para mujer Colegio Navy Zapatillas de trail running Nitrel v1 FuelCore para mujer New Balance Acero , Zapato San Antonio Mujer SAS, Zapatilla de deporte Freetime con cordones Blanco , Zapatillas de running NIKE para mujer Air Max Motion LW Armory Blue / Pure Platinum / Pure Platinum , Saucony Women s Ride 10 zapatillas para correr Gris Skechers Women s Go 4-14918 Calzado para caminar Blanco negro Prop & eacute; t Zapatillas para caminar TravelFit para mujer Lima / Azul , Zapatillas para caminar Skechers Performance para mujer Go Flex Train Heather gris Zapatillas de viaje Propet para mujer Denim Sky Blue , PUMA Mujer Ignite Flash Evoknit Stripped Wn Sneaker Brillante Plasma-Puma Blanco Converse Chuck Taylor All Star Core Ox Sodalita Azul / Blanco , Zapato de skate Chelsea Se de mujer DC Negro / Plata / Negro , Zapatilla de deporte KAANAS Santa Fe Fashion Skate Slip-on Casual Sneaker Almendra Star Wars Jedi Obi-Wan Kenobi Cosplay Shoes Botas marrones por encargo Vans Auténtico Pale Khaki / True White Sandalia para mujer FRYE Ally Criss Cross Slide Blanco , Sandalia Aerosoles Midday Women Slide Tela negra , Zapatillas para correr Nike Womens Air Zoom Pegasus 35 Elemental Rose / Barely Rose Zapatos OLUKAI Pehuea - Mujer Clay Honu / Clay Botas de cuero Fly London Womens Yogi Rojo Córdoba , Bota Chukka W Coromar para mujer Teva Negro Mocasín de gamuza Kilty de Minnetonka para mujer Rosado

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 de running Vapor Pureboost X de adidas running Performance blanco para mujer Ray Red/ Vapor rosa/ blanco e34b39e 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.

Carretera en funcionamiento
Sketchpad Gallery These are some of my best sketches. You may find them useful or interesting by themselves.

Geometry Construction Reference

Thirteen elementary straightedge 2065417
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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.


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