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.

Zapatillas Onitsuka de azul deporte Onitsuka Tiger Mexico 66 Blanco 5626/ azul oscuro e2199a2




Cuero
Importado
Sintético suela
Cuero zapatilla deportiva firma Tiger Rayas con logo lengua y talón etiqueta
Tratado suela de goma
desgastado en el México Olímpico Juegos en 1968
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


Zapatillas Onitsuka de azul deporte Onitsuka Tiger Mexico 66 Blanco 5626/ azul oscuro e2199a2 - 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

Zapatillas Onitsuka de azul deporte Onitsuka Tiger Mexico 66 Blanco 5626/ azul oscuro e2199a2

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.


Zapatillas Onitsuka de azul deporte Onitsuka Tiger Mexico 66 Blanco 5626/ azul oscuro e2199a2

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 Reebok Print Lite Rush Gr para mujer Gr - Blue Lagoon / Solid Teal / White Zapatillas de running Adidas Performance Ultra s Boost M para hombre Negro / negro / amarillo solar , Zapatillas náuticas para mujer Saucony Originals Coral Zapatillas de running NIKE Roshe Two para mujer Verde , Zapatillas de running Saucony Women s Triumph ISO 4 Vizi Rojo / Blanco Zapatillas de deporte adv W de adidas Originals para mujer Blanco / Blanco / Gris Uno NIKE Men s Lunar Fingertrap Cross Trainer Binario Azul Blanco Negro , Zapatillas Spira Aquarius Running para mujer gris , Zapatillas Merrell Women s Encore Nova Slip On Black Smooth NIKE Women s WMNS Zoom Fly, negro / blanco Apenas gris / Sequoia , Sandalia deportiva NIKE Kids Kawa Slide (GS / PS) Blanco negro Converse Chuck Taylor All Star Seasonal Color Hola Carbón , Zapatillas de running Saucony Women s Triumph ISO 4 Niebla / gris , Zapato NIKE Roshe One femenino Bronzine / Black / Sail Zapatillas antideslizantes Skechers for Work para mujer Eldred Blanco , Zapato de running ASICS GEL-Kayano 22 para mujer Plata / Carbono / Turquois , NIKE Women s Tanjun Binario Azul / Peltre Metálico / Vela Converse Chuck Taylor All Star Seasonal Color Hola Monocromo negro , Zapatillas de running Questar Tnd W, para mujer, de adidas Carbono / Clear Aqua / Core Black , Carro de mujer Brooks Naranja / Royal Purple / White , Zapatillas de running NIKE Unisex Flyknit Racer Negro / Negro-hiper Naranja-vívido Púrpura Zapato de running NIKE Kids Tanjun Print (GS) Negro / Negro / Blanco / Hyper Pink , Sandalia deportiva NIKE Kids Kawa Slide (GS / PS) Blanco negro , NIKE Women s WMNS Zoom Fly, negro / blanco Blanco negro Zapatillas de deporte Onitsuka Tiger Mexico 66 Plata / Plata Brooks Mujeres Transcend 5 Negro / Púrpura / Multi , Zapatillas de running Adidas Performance Ultra s Boost M para hombre Gris / plata , Top corto de mujer Saucony Bullet Carbon Print STYJHS Acuarela tortuga en agua ligero malla zapatillas Imprimir zapatillas de deporte ,
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 ONEMIX Zapatillas de deporte de aire para mujer Coloridas reflexiones Zapatillas de deporte de estilo deportivo Negro , Zapatillas de running New Balance Foam Cruz V1 para mujer New Balance Nube de lluvia / Artic Fox Carro de mujer Brooks Blue Atoll / Black , Converse Chuck Taylor All Star Seasonal Color Hola rojo , Zapatillas para correr Under Armour UA Speedform Fortis 2 para mujer Negro Sandalia Merrell para mujer Terran Ari Post Sport Negro Saucony Triumph ISO 3 Running Sneaker para mujer Púrpura / azul / Citron , Zapatillas de trail running Ryka Women s Intent XT 2 SR Blanco / plata cromada , Zapatillas de deporte Skechers Sport Women s Empire Inside Look Black Mint , Sandalia de tira de Ghillie Bre-Italy Bella Vita para mujer Cuero de ante de tabaco , Zapatillas de running Skechers Performance para mujer Go Run 400 Action Negro Zapatillas para caminar Go Walk 4 Propel de Skechers Performance para mujer Gris pardo , LifeStride Women s Easy Sandal Azul Nike Hombres Air Zoom Pegasus 33 Lobo gris / negro / gris oscuro / azul , Salvatore Ferragamo Womens Enfola Nero Alexandre Calf , Salvatore Ferragamo Women s Groove Bianco / Oro Zapatillas de running Fresh Foam 1080v7 para mujer New Balance Ozone Blue Glow / Lime Glow , Bomba Nikole para mujer Via Spiga Patente negra , Sandalia Tallis de mujer VANELi Blanco Verano Vip , Prop & eacute; t Zapatillas para mujer TravelFit Hi Walking Silver Metallic Zapatillas de paseo Skechers Go Walk Lite-15433 para mujer Gris pardo Zapatillas de deporte Under Armour Men s Street Precision Mid Gris Nublado (941) / Glacier Grey , Allrounder de Mephisto NIRO Diamonds Mary Jane Flat Black T Metallic / W Mesh , Drew Shoe La alegría de las mujeres Blanco , Reebok Zapatillas de deporte Royal Aspire 2 Fashion para mujer Blanco / Congelación Metálica , Bota de montar Xandywc para mujer LifeStride, pantorrilla ancha Negro , Bota de hebilla Emery para mujer Merrell Moho , Sandalia Birkenstock de cuero Florida para mujer Negro Birko-flor , G.H. Leimoncello , Bota posterior Aerosoles para mujer 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.

Zapatillas Onitsuka de azul deporte Onitsuka Tiger Mexico 66 Blanco 5626/ azul oscuro e2199a2 - 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 Zapatillas Onitsuka de azul deporte Onitsuka Tiger Mexico 66 Blanco 5626/ azul oscuro e2199a2 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.

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

Geometry Construction Reference

Thirteen elementary straightedge 5990168
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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.