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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Modelo sintético
Número: AH6804006
Género: para mujer
Color: DESERT SAND / WHITE
Hecho En: Indonesia
Marca Nuevo con Original Caja
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


NIKE W Air Blanco Huarache City 17056 Low Women W Ah6804-006 Arena del desierto/ Blanco df8594c - 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

NIKE W Air Blanco Huarache City 17056 Low Women W Ah6804-006 Arena del desierto/ Blanco df8594c

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.


NIKE W Air Blanco Huarache City 17056 Low Women W Ah6804-006 Arena del desierto/ Blanco df8594c

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 running ASICS Gel-Cumulus 19 para hombre Primer rojo / negro / plata , Soulsfeng para hombres Moda femenina Zapatos deportivos de encaje up Amortiguación transpirable Diseño de flores de tela Zapatillas de deporte para parejas Blanco NIKE Men s Benassi Just Do It Athletic Sandal Blanco / Variedad Royal White Zapatillas de running adidas Women s Edge Lux W Negrita Rosa / Haze Coral / Negro , Zapatillas de running adidas Alphabounce Beyond para mujer Gris / gris / naranja claro Zapatillas para correr Nike Women s Free Rn Flyknit 2017 Negro / Blanco-Gris Oscuro Calzado deportivo NIKE CK Racer para mujer Armory Blue / Armory Navy / Pure Platinum , Zapatillas de running Alphabounce W para mujer adidas Performance Blanco / Cristal Blanco / Gris Uno Zapatillas de running Spira para mujer Stinger 3 Bubblegum / Blanco Zapatillas de running Altra Women s Intuition 4 Gris / morado ASICS La sacudida de las mujeres Ónix negro , Saucony Women s Ride 10 zapatillas para correr Gray Berry , Zapato de running ASICS Gel-Quantum 360 cm para mujer Punto medio gris / glaciar / coral , Calzado de running NIKE RN 2017 2017 para mujer Pure Platinum / Black / Wolf Gray / Cool Gray , Zapatillas de running ST-2 para mujer Topo Athletic Verde gris Zapatillas para correr New Balance Rushv3 para mujer Trueno Negro , Zapatillas de tenis ASICS Gel-Game 6 para mujer Gris medio / rosa fuerte / blanco , Zapatillas para correr Saucony Women s Cohesion 10 Armada , Zapatillas para correr WRL247WM New Balance para mujer Estratos , Calzado de running Ryka Ultimate Form para mujer Negro / Plata , Zapatillas de running New Balance Foam Cruz V1 para mujer New Balance Negro / sal marina Zapatillas de running Gel-Moya para mujer de ASICS Gris / plata ASICS Gel-Nimbus 20 Platinum femenino Carbono / Plata , Zapatillas Reebok Women s Runner 2.0 MT Track Cráneo gris / Verde azulado / Blanco / Negro / Plateado Metálico Zapato de running Saucony Zealot ISO 3 para mujer Azul marino Púrpura , Zapato para correr Saucony Women s Cohesion 9 Plata / azul / limo , Zapatillas de running EM Road M2 v2 para mujer Pearl Izumi Shadow Gray / Argel Blue , Zapatillas de running ASICS Gel-Flux 4 para mujer Negro / Plata / Carbono Zapatillas de entrenamiento Primus Lite para entrenamiento de mujer Vivobarefoot Verde / Heather ,
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 Sandalia Uneek O2-w de mujer KEEN Acero Gris / Vapor , NIKE Women s Tanjun Blanco Blanco Negro , Zapatillas de running deportivas New Foam Lazr V1 de New Balance para mujer Coral vivo / negro / blanco Munsell , Sandalia deportiva Tirra para mujer Teva Teal / Dark Shadow Encaje de quimera de Columbia para mujer Rsealev Zapato de Trail Hellcat Boombah para hombres - 14 Opciones de color - Varios tamaños Negro / gris , CLARKS Sandalia plana Brizo Cady para mujer Coral , Zapatillas para caminar Go Step Lite-Solace de Skechers Performance para mujer Negro , Dr. Comfort Lu Lu Profundidad terapéutica para diabéticos terapéuticos Mujer Velcro de cuero para zapatos castaña BareTraps Keely Sandal para mujer Caramelo , Zapatillas de running adidas Alphabounce Em W para mujer Mystery Petrol / Gray Two / Petrol Night Zapatillas para caminar Omni Walker Grid de mujer Saucony Negro Drew Shoe Athena para mujeres Blanco azul Sam Edelman Sandalia de mujer Berke Cuero Vaquero Negro Vaquero Zapatilla deportiva con cordones Slip-On Onitsuka Tiger Mexico 66 Ash Rose / Ash Rose , Calzado de trabajo resistente al deslizamiento Memory Flux de Fila para mujeres Negro / Negro / Negro Zapatilla de pies Cush N de Prop & eacute; t para mujeres Merlot Corduroy , Clásicos de base Slip-on (Tm) para hombres de Vans Llama Negro Vans Unisex Old Skool Zapatillas clásicas de skate Negro / Blanco verdadero , Sam Edelman Sandalia mujer Shaye Slide Teal , Sandalia Rockdale Lanea Woven Slide para mujer Tejido negro Sandalia Super Cool Slide de Aerosoles para mujer Coral Zapatillas de salón Yvette para mujeres de Bloch Oro , 50 tonos de oro Colección de zapatos de baile, Noche de confort Vestido de boda bombas, Zapatos de salón Para América, Tango, Salsa, Swing, Theather Arte por 50 sombras (2.5 \ Tacones) S92309 Trenza dorada y plateada Zapatillas de triatlón Tri X-Speed ​​3 para mujer Louis Garneau Blanco / Mojito Glerups Unisex G-01 - Botas de fieltro Naturaleza Marrón Botín de tobillo Mazin Cayto para mujer Hush Puppies Negro Tiempo libre para mujeres de SAS Negro , Zapatos con cordones Wolky Comfort Gobly 40150 Gamuza Taupe , Vionic Womens Elevated Becca Wedge con cordones Gris ,

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.

NIKE W Air Blanco Huarache City 17056 Low Women W Ah6804-006 Arena del desierto/ Blanco df8594c - 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 NIKE W Air Blanco Huarache City 17056 Low Women W Ah6804-006 Arena del desierto/ Blanco df8594c 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 2076665
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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.