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.

Clásicos de base Slip-on (Mix de (Tm) para hombres de Vans Vans (Mix Checker) Negro/ Blanco verdadero cd051e0




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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


Clásicos de base Slip-on (Mix de (Tm) para hombres de Vans Vans (Mix Checker) Negro/ Blanco verdadero cd051e0 - movie-store.online

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

Clásicos de base Slip-on (Mix de (Tm) para hombres de Vans Vans (Mix Checker) Negro/ Blanco verdadero cd051e0

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.


Clásicos de base Slip-on (Mix de (Tm) para hombres de Vans Vans (Mix Checker) Negro/ Blanco verdadero cd051e0

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 Unisex Skate Trainers de Vans Authentic True White Zapatillas Supra Titanium Skate Lt Gray-bone / Gum , Vans Auténtico High Rise / Pewter Zapatillas de skate Heathrow DC para mujer Ceniza gris , Vans Sk8-Hi Unisex Top informal Zapatos de skate, cómodos y duradero en Waffle de la firma Suela de goma Lona negra / blanca Zapato de skate casual Heathrow DC para hombre Negro / gris oscuro Clásicos de base Slip-on (Tm) para hombres de Vans Tablero de ajedrez negro / blanco , Supra Vaider Skate Shoe Negro / negro blanco , Supra Vaider LC Sneaker Rojo blanco , Clásicos de base Slip-on (Tm) para hombres de Vans Negro Negro Zapatillas de skate Etnies Women s Scout W s Gris / rosa , Vans Auténtico (Brite) neón Rosa / Negro , Clásicos de base Slip-on (Tm) para hombres de Vans Negro Negro Clásicos de base Slip-on (Tm) para hombres de Vans Clásico Negro / Blanco Vans Auténtico Negro / Blanco verdadero , Zapato de skate DC Women s Magnolia TX SE Blanco / Blanco / Rojo Atlético Vans Sk8-Hi Unisex Top informal Zapatos de skate, cómodos y duradero en Waffle de la firma Suela de goma (Mte) Negro / Blanco verdadero , Zapatillas de skate DC Evan Hi Tx Se W para mujer Negro / Rojo , Clásicos de base Slip-on (Tm) para hombres de Vans Negro Negro , Star Wars Jedi Obi-Wan Kenobi Cosplay Shoes Botas marrones por encargo Vans Auténtico rojo Vans Auténtico Madder Brown / True White Clásicos de base Slip-on (Tm) para hombres de Vans (Checker) Racing Rojo / Blanco Vans Unisex Old Skool Zapatillas clásicas de skate Borgoña / True White Zapatillas de skate Vans Unisex Authentic Platform Negro Zapatillas de skate Vans Unisex Authentic Platform (Retro Sport) Sunflower 7294 , Zapato de skate casual Heathrow DC para hombre Verde Clásicos de base Slip-on (Tm) para hombres de Vans Negro Negro Zapatillas de skate Vans Unisex Authentic Platform (Diy) Negro / Blanco verdadero 7288
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 Zapato deportivo ASICS Gel-Excite 4 para mujer Aruba Azul / Plata / Acuario , Under Armour Threadborne Slingflex para mujer Flint / Rhino Gray / Lavender Ice , Propet Women s TravelActiv Ss Sandal Negro rojo , Sandalia Atlética de Cuero Caprizee Columbia para Mujer Stone / Oxford Tan NIKE Women s WMNS Zoom Fly, negro / blanco Vasto gris Drew Shoe Athena para mujeres Crema / Combo G.H. Coñac , Indigo Rd. Azul , Zapatillas de running adidas Duramo 3 para mujer Correr Blanco / Visión Azul / Plata Metálica Skechers Performance Women s Define Wide Sneaker Blanco negro , Drew Womens Element Nubuck marrón , Bomba de vestido Nika BeautiFeel para mujer Negro Negro , Sandalia Huarache Easy Street Allure para mujer Blanco / Metálico Imprimir Brooks Womens Hyperion Imperial Purple / Blue Jewel / Vida Nocturna , Zapatillas de running Vibram para mujer V Amarillo ALMA NATURAL Ballet femenino femenino Negro , BareTraps Women s Dasie Platform Sandal Blanco Multi , Zapatillas de deporte Converse Chuck Taylor All Star Coral Ox para mujer Costa Azul / Blanco / Negro Zapatillas Cross-Trainer Ryce para mujer Enhance 3 Jugo de uva BLANCO MONTAÑA Zapatos Lorna Mujeres Sandalia Aceituna Zapatillas para caminar ProFit TravelFit Slide para mujer Negro rojo Zapato de entrenamiento cruzado Ryka Women s Vida RZX Lima / azul / verde azulado Converse Chuck Taylor All Star Core Ox Blanco negro NIKE Blazer Mujer Low SE Premium , Under Armour Ua ClutchFit Drive Ii para hombre Gris / amarillo Sandalia de cuero Lucili de Nine West para mujer Negro / Cuero Multi Flip Flop FitFlop Carmel Toe para los pies de las mujeres Azul Zapatillas de ciclismo Shimano SH-RP9 - Hombre Negro , Zapatilla UGG Scuffette II para mujer Café exprés Steffie de mujer Franco Sarto Gamuza gamuza ,

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.

Clásicos de base Slip-on (Mix de (Tm) para hombres de Vans Vans (Mix Checker) Negro/ Blanco verdadero cd051e0 - movie-store.online


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 Clásicos de base Slip-on (Mix de (Tm) para hombres de Vans Vans (Mix Checker) Negro/ Blanco verdadero cd051e0 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.

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

Geometry Construction Reference

Thirteen elementary straightedge 3442658
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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.