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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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

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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,

Montrail Fluidflex F.K.T. Zour / Camaleón , Zapatillas adidas Outdoor Terrex Agravic Speed ​​Shoe de mujer Negro, negro, blanco , Salomon Women s X-Mission 3 W-w Blazer azul marino / Jugo de uva / Atlántico Norte Zapatillas deportivas de malla al aire libre de malla transpirable de Onemix para hombre Amarillo negro Zapatillas de running para exteriores adidas outdoor Terrex Tracerocker W para mujer Gray Five / Chalk White / Easy Coral , Zapatillas adidas Outdoor Terrex Agravic Speed ​​Shoe de mujer Negro, negro, blanco , Atletismo femenino de Apex Blanco , Zapatillas de trail running Salomon Speedcross 4 para hombre Poseidón , Vionic Womens Cypress Trail Walker Gris / verde azulado Zapato de Trail Hellcat Boombah para hombres - 14 Opciones de color - Varios tamaños Gris / azul marino , Zapatillas de running Lagetiva Wildcat Trail para mujer Gris / mantequilla Zapatillas de running NIKE LD Runner LW para mujer Negro / Volt-Glacier Blue , Zapatillas de running NIKE Zoom All Out Low para hombre Obisidian / Paramount Blue-black Zapatillas de trail running WT10v1 Minimus para mujer New Balance Gris azul El corredor de mujeres Xa Pro 3D W de Salomon Negro Zapatillas de running Salomon Women s Speedcross Pro 2 W Trail Negro , Salomon Women s Speedcross 4 W Trail Runner Rojo tibetano / sangría / negro , Zapatillas de senderismo de malla Caldorado para mujer Montrail Gris Claro / Océano Tropical , MT-onemix Women Men Awesome 3-en-1 zapatos ligeros Athletic Sneaker de Roma Negro / Rojo I ASICS Gel-Kahana 8 Trail Runner femenino Gris medio / carbono / Limelight Columbia Montrail Women s Trans Alps F.K.T. Jade Lime, Splash Zapatillas Merrell Women s Vapor Glove 2 Barefoot Trail Running Verde brillante / púrpura MT-onemix Lovers Calzado deportivo ligero de malla Running Jogging Sneakers Verde gris Zapatillas de running adidas Galaxy Trail W para mujer Negro / Fácil Menta / Blanco Corredor de Trail Speedtrak W Salomon para mujeres Monumento , Zapatillas de running Mizuno Women s Wave Kazan Trail Gunmetal / Yellow Cream , Salomon Women s Speedcross 4 W Trail Runner Negro / Negro / Negro Metálico , Zapatillas de senderismo Air Mesh de Ahnu para mujer con malla de aire Tahoe , Salomon Women s Speedcross 4 W Trail Runner Negro / Negro / Negro Metálico ,
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 Under Armour Threadborne Slingflex para mujer Apollo Gray (101) / Overcast Grey , Zapatillas de running Under Armour Speedform Intake 2 para mujer Puerto marítimo (300) / Marfil , Zapatillas de running Pure Cloudfoam de adidas para mujer Carbono / carbono Earth Origins Sophie Azul marino Zapatillas de running Adidas Performance Ultra s Boost M para hombre Azul / Misterio Azul / Negro , Zapatillas de entrenamiento Nike Womens Metcon 3 Negro / Blanco-volt-cloro Azul adidas outdoor para mujer Terrex Swift R2 GTX Grey Three / Gray Two / Chalk Coral , Sandalia deportiva Nolita para mujer Anne Klein Tela Coral , Sanda Verra Teva para mujer Orquídea púrpura Zapatillas de deporte Vans reflexivas ISO 1.5 para hombre Negro , CLARKS Lexi Myrtle Sandal para mujer Cuero de arena , Tecnología Vionic Men s Orthaheel White / Navy Walker Peltre suave / negro Chaco Mujer Zcloud X Sandalia Deportiva Blazer Green Skechers Women s Go 4-14918 Calzado para caminar Azul marino / gris Sandalia Tessa de mujer Miz Mooz Negro Zapatillas de running retro Gel-Lyte III para mujer ASICS Azul clásico / azul clásico Zapatillas de correr de espuma fresca New Balance 1080v8 para mujer Azul claro , Zapato de caminar WW1300v1 para mujer New Balance Gris , Reebok Crossfit Nano 7.0 Track Shoe para mujer Azul / negro / plata / blanco , Zapatillas de entrenamiento cruzado WOM s Tazon 6 Accent WN de PUMA para mujer Quarry-puma White-aruba Blue , Zapatillas para mujer Cloud 2568 Caliber Slide Tan / azul claro Vans Auténtico Ebano / Frost Grey , Sandalias planas para piscina Walking Cradles para mujer marrón , Sandalia Dolce Vita Jene Slide para mujer Light Blush Satin , Sandalia Venice de Alegria para mujer Morning Glory Tan , Sandalia mujer Jessica Simpson, diadema Crizma Lux Magenta , Trotters para mujer Dea Slingback Pump Armada Zapato de construcción y construcción Nano Toe / Tater para mujer Caterpillar Fragment Tater CLARKS Mujeres Raisie Bloom Oxford Tweedcombi negro TOMS - Suela de lino de lino clásica, cómoda y de ajuste fácil para mujer Fiesta Orange Heritage Canvas

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.

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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 Browning Buck Frost Pursuit Browning Trail Shoes para mujer Frost Grey Ming/ Ming 7bef2b2 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.

Trail Running
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.