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.

Zapato de entrenamiento cruzado GEL-190 medianoche TR B0711SW4DX para mujer ASICS mujer Blanco/ Vinca/ Marina de medianoche fb7d29a




Sintético
Importado
Caucho único
Eje mide aproximadamente Parte baja del arco
DuoMax Sistema de apoyo: Una doble densidad sistema de la suela intermedia posicionado para mejorar soporte y estabilidad, deporte posicionado específicamente
Rearfoot GEL acolchado Sistema: Atenúa choque durante el impacto fase y permite para una transición sin problemas a medio cuerpo
SpEVA Material de la suela intermedia: Mejora el rebote características de la espalda y disminuye la entresuela Descompostura.
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


Zapato de entrenamiento cruzado GEL-190 medianoche TR B0711SW4DX para mujer ASICS mujer Blanco/ Vinca/ Marina de medianoche fb7d29a - 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

Zapato de entrenamiento cruzado GEL-190 medianoche TR B0711SW4DX para mujer ASICS mujer Blanco/ Vinca/ Marina de medianoche fb7d29a

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.


Zapato de entrenamiento cruzado GEL-190 medianoche TR B0711SW4DX para mujer ASICS mujer Blanco/ Vinca/ Marina de medianoche fb7d29a

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 de running Saucony Women s Freedom ISO Rosado morado Zapato de running Mach de HOKA ONE ONE para mujer Bluebird / Blanco , Skechers Performance On The Go 400 Tropical Flip Flop Negro / gris Sandalia Teva Women s W Hurricane XLT Infinity Sport de Teva Pimenton , Zapatillas de running adidas Alphabounce 1 Parley W, para mujer Noble Indigo / Vapor Azul / Blanco Zapatillas de running acolchadas 420v4 para mujer New Balance Silver Mink , Zapatillas de running New Balance 1340v3 para mujer Gris oscuro , Zapatillas de running Trail Speed ​​Speedstride de Fila para mujer Dark Shadow / Black / Aruba Blue Zapatillas de running adidas Galaxy Trail W para mujer Negro / Fácil Menta / Blanco , Zapatillas para mujer Cloud 2568 Caliber Slide rojo azul , Zapatillas Mizuno Running Women s Wave Creation 19 Imán / Plata Zapatillas de running Altra AFW1837F para mujer Torin 3.5 Rosado , Zapatillas de running ASICS Gel-Kayano 23 para mujer Cacatúa / Seguridad Amarillo / Lapis , OLUKAI Awe Awe Slipper - Mujer Dark Shadow / Pewter Easy Spirit Women s Traveltime Mule Cuero blanco / azul claro Zapatillas Adidas de mujer, atletismo y rebote Cross-Trainer Colegial azul marino / Gris vapor / Azul marino oscuro , Sandalia de las mujeres de la marca de Lucky Brand Pulir HEAD Nitro Pro Indoor Shoe para hombre Azul Empuje cargado de Under Armour para mujer Grosella negra (600) / rojo Clásicos de base Slip-on (Tm) para hombres de Vans Carmesí / blanco Zapato de skate casual Heathrow DC para hombre Negro / gris oscuro , Vans Auténtico Tartán Vestido Blues Vivien Flat de Bella Vita para mujeres Cuero de gamuza de cabrito negro Vans Auténtico Azul marino / verdadero blanco , Converse Unisex Chuck Taylor All-Star Top casual Sneakers en Classic Estilo y color y lienzo duradero Uppers Blanco óptico Sam Edelman sandalia de mujer Sera Slide Caparazón rosa Wolky Comfort Sneakers Ewood 70820 canales de mezclilla , Bota de senderismo impermeable X Alp MTN GTX para hombre Salomon Negro / Asfalto / Pulga Botas de trabajo de punta compuesto Macey para mujer de Ariat Cacahuete oscuro Wolky Comfort Sneakers Ewood 70820 canales de mezclilla ,

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.

Zapato de entrenamiento cruzado GEL-190 medianoche TR B0711SW4DX para mujer ASICS mujer Blanco/ Vinca/ Marina de medianoche fb7d29a - 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 Zapato de entrenamiento cruzado GEL-190 medianoche TR B0711SW4DX para mujer ASICS mujer Blanco/ Vinca/ Marina de medianoche fb7d29a 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.

Fitness y entrenamiento cruzado
Sketchpad Gallery These are some of my best sketches. You may find them useful or interesting by themselves.

Geometry Construction Reference

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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.