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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tejido y sintético
Caucho suela
Reflexología Masaje en un zapato. La reflexología es una terapia natural para tu mente y cuerpo y objetivos traer tu cuerpo volver a un estado de equilibrio a través de áreas de desbloqueo de congestion Disfruta los beneficios de reflexología diariamente, por el precio de ¡un tratamiento de una hora!
Shock Suela absorbente y comodidad del amortiguador Suela, ideal para pies cansados ​​y doloridos o si estás en tus pies mucho. Disfruta como diapositivas ¡o zapatillas!
Arch Soporte, ideal para pies planos o aquellos con caídos arcos.
Reportado Beneficios incluidos alivio de la espalda, dolor de cuello y rodilla artritis y articulaciones dolor, pie y dolor de talón, plantar fascitis, morton neuroma, periférico neuropatía diabética pies, insomnio, piernas inquietas, retención de líquidos, ciática, energía niveles.
Disponible en los tamaños 5-14 de EE. UU., colores múltiples y estilos
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

Revs Revs Seva Sandals, Sandalias Soporte de reflexología Para mujeres. hombres y mujeres. Absorción de impactos, Cojín Comfort & Soporte del arco Broncearse e9ad407

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,

Sandalia de mujer Bellini Nickel Turquesa , Sandalia Paula Fisherman de Haflinger para mujer Cuero Mocha Nubuck Earth Origins Sophie Azul marroquí Sandalia para mujer Terrell Ari Wrap Sport de Merrell Negro , Sandalia Kea Vent mujer Columbia Negro, pizarra Sandalia original Teva Women s Original Campo Negro / Blanco Chaco Women s Zx2 Classic Athletic Sandal Wink Blue Sandalia KEEN Clearwater CNX para mujer Celestial / Vapor , KEEN Hombres Newport H2 Sandal Cuervo / Aluminio Earth Origins Sophie Platino , Earth Origins Sophie Azul marroquí Chancleta Eezay adidas para mujer Tactile Green Haze Coral Colegial Navy Columbia Women s Barraca & shy; Sunlight Athletic Sandal Blanco negro Sandalia de cuña Rheta Sam Edelman para mujer Negro / Marfil , KEEN Hombres Newport H2 Sandal Negro , Earth Origins Sophie Women s Sandal Frost Grey , Sandalias de deporte Nike Kawa Sport Shower Slide, negro / blanco Blanco negro , Skechers Performance On The Go 400 Tropical Flip Flop Grey Tropical , Sanda Verra Teva para mujer Atlántico Norte Sandalias KEEN Mujer Whisper-w Sterling Blue / Vestido Azul , Sandalia Merrell Tetrex Crest Wrap Sport para mujer Vapor Sandalia de mujer Drew Alana Verde / Fucsia CLARKS Womens Wave Grip Negro sintético Wolky Comfort Jewel Black Croco , Sandalia de mujer Drew Alana Naranja amarillo Wolky Comfort Jewel Estampado de flores blancas , Sandalia de cuero Maya New Balance para mujer Negro Sandalia Omnium de mujer Teva Pizarra Sandalia Archie Fisherman del Dr. Scholl Monumento / Sugar Rose
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 Converse Chuck Taylor All Star Seasonal Color Hola Blanco óptico Zapatillas para correr ASICS Gel-Venture 6 para mujer Phantom / Coral / Lima , Zapatillas de deporte Reebok Print Lite Rush Gr para mujer Gr - Blue Lagoon / Solid Teal / White , Converse Chuck Taylor All Star Seasonal Color Hola Naranja solar OluKai Kulapa Kai Pokeberry / Black Calzado deportivo Inov-8 Roclite 315 para mujer Verde azulado / negro Zapatillas de running NIKE Unisex Flyknit Racer Blanco, Blanco-vela-puro Platino , Zapatillas de running ONEMIX para hombre y mujer Zapatillas de deporte para correr Amarillo negro Zapatillas Mujer Salomon Sonic RA Max Negro / Navegar por Internet Negro / Navegar por la Web , Zapatillas de trail running Salomon Speedcross 4 para hombre Blue Yonder / Black / Lava Orange , Propet Women s Fisherman Sandal Mezclilla Sandalia LifeStride para mujer Eden Negro , Brooks Womens Adrenaline GTS 18 Ébano / plata / rosa , Zapatillas NIKE Flex Adapt TR Cross Trainer para mujer Pure Platinum / Black / White - Volt Trotters Mujer Simmy Mary Jane Flat Ante azul marino , Allrounder por Mephisto Womens Madrigal Añil Índigo Sandalia Pisa de mujer amarilla Armada Calzado para caminar WW812 para mujer New Balance Negro , Easy Spirit Women s Traveltime Mule Marrón medio Sandalia Drew Cascade para mujer Sand Nubuck Zapatilla de deporte de gamuza bala para mujer Gola Azul marino / blanco , Sam Edelman Sandalia Glenn para mujer Marfil moderno Skechers Women s Walk Walk Joy Terrific Sneaker Azul marino / blanco Bota de mujer L19 de Arcopedico Negro Naturalizer Michelle s Dress Dress Pump Serpiente negra , Zapatilla Dakota de las mujeres de Australia UGG Girasol Zapatilla de pies Cush N de Prop & eacute; t para mujeres Armada Bota de mujer FRYE Nova Flower Tall marrón , TOMS Womens Desert Wedge Bootie Black.suede, wedge, TOMS - Suela de lino de lino clásica, cómoda y de ajuste fácil para mujer Armada ,

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.


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 Revs Revs Seva Sandals, Sandalias Soporte de reflexología Para mujeres. hombres y mujeres. Absorción de impactos, Cojín Comfort & Soporte del arco Broncearse e9ad407 it out, and I got a chance to try out this new graphics software.


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.

Sandalias y toboganes deportivos
Sketchpad Gallery These are some of my best sketches. You may find them useful or interesting by themselves.

Geometry Construction Reference

Thirteen elementary straightedge 2440802
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.