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

Bomba de vestido mujer Pointe para 11637 mujer Easy B01MRX35SY Street Patente desnuda e052c60

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,

Estimado Zapatillas de piel de oveja de Marruecos Babouche ZELLIGE Índigo , TOMS - Slip-On de lienzo clásico para hombre Lana negra / Faux Shearling , Zapatilla de mujer Old Friend Scuff castaña , Mujeres de Modemoven Charol Bombas, Point Toe Tacones, Slingback Bombas, zapatos de noche, lindo Stilettos 10CM Negro plata Zapatillas de mujer de Overland Emma Classic Sheepskin castaña Bomba Sadie Wedge 40MM de Cole Haan para mujer Patente desnuda Bombas de charol de mujer Modemoven, tacones peep toe, sandalias Slingback, zapatos de noche, stilettos lindos Degradado púrpura Zapatilla Saraih2 Easy Spirit para mujer Gris Bota Deia para mujer de TOMS Caramelo Sandalia de vestir Carrson de mujer Steve Madden Terciopelo rosa , Zapatilla de pies Cush N de Prop & eacute; t para mujeres Corduroy de arena Sandalia de vestir Carrson de mujer Steve Madden Cuero blanco , Pantuflas de Katy Perry para mujer Negro , Trotters para mujer Dea Slingback Pump Armada Haflinger Women s AT Storm Flat Carbón Bomba de vestido Brady Calvin Klein para mujer Caramelo Bomba Saldana LifeStride para mujer Negro 001 , Zapatilla de tela Henrii de Nine West para mujer Tela negra , Sandalia de golf Sandbaggers Carrie para mujer Pistacho , Pantuflas de lana extrafinas para hombre Foamtreads Carbón Marc Jacobs Sienna Espadrille Ballet Mujer plana Blanco negro , TOMS - Slip-On de lienzo clásico para hombre Ceniza , Bomba de vestido asimétrico para mujer Aravon Black Leathe MUK LUKS Suede Jane Moccasin Slipper Marron oscuro Bomba de derivación para mujer Anne Klein Rosa Claro Sintético , Zapatilla desnuda V-Soul de Vibram para mujer Desnudo J. Rene233; Lemmon JOE N JOYCE Tokio Mesh sandalias de suela suave Creme , Puf lindo de Patricia Green para mujer Arena ,
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 Brooks Women s Adrenaline GTS 17 Negro / antracita , Zapatillas de running Saucony Women s Triumph ISO 2 Verde azulado / negro / blanco Zapatillas de running adidas Adaptive Adapt para mujer Blanco / Blanco / Gris Earth Origins Sophie Negro NIKE Men s Lunar Fingertrap Cross Trainer Blanco, Obsidiana, Rojo Zapatillas de running NIKE Runallday para mujer Negro / Leche Azul Gris Oscuro Zapato deportivo ASICS Gel-Excite 4 para mujer Aruba Azul / Plata / Acuario , Naot Footwear Women s Brussels Cuero Lustre Negro , Zapatillas de running adidas Women s Edge Lux W Negro / Energía / Blanco Zapatillas para caminar Reebok Women s Cloudride LS DMX Manic Cherry / Fire Spark / White , Zapatillas adidas Outdoor Terrex Agravic Speed ​​Shoe de mujer Easy Coral, Negro, Blanco Sam Edelman Geren Sandalia para mujer Gamuza de Caramelo Dorado Zapatillas de running Reebok para mujer Denim Glow / Faux Indigo / Coral / Blanco MAIERNISI JESSI Clásico de mujeres para hombres Estiramiento de dos correas Sandalias de tacón bajo (Las mujeres necesitan 1.5-2 Tamaño abajo) Blanco , Brooks Womens Adrenaline GTS 18 Blanco / Blanco / Gris Zapato deportivo para acolchado 635v2 New Balance para mujer Gris , Zapatillas de running adidas Aerobounce W para mujer Negro / Blanco / Blanco , ALLROUNDER by MEPHISTO Zapatillas Mujer Fina Tex Sport Negro caucho / Marrón G Nubuck , New Balance FuelCore Nergize V1 Fuel Core Cross Trainer para mujeres Silver Mink / Pigment , NIKE Men s in-Season 7 Cross Trainer Gris oscuro / Barely Volt - Aurora Verde , ASICS para mujer Gel-Fit Yui 2 SE Negro / Limelight / Plata Hush Puppies Mujeres Power Walker Ii Loafer Gris pardo Sandalia de mujer Hana Slide de Via Spiga Cuero de porcelana Sandalia Sloan Slide de Naturalizer para mujer Alabastro Sandalia Heather Slide de mujer Vía Spiga Midnight Suede Zapato de punto de equilibrio europeo Bloch para mujer Multicolor Zapatos de paloma de oro 50 tonos de 1 \ Baile bajo del talón Zapatos de vestir: Mujeres Comfort Ballroom, Latín, tango, salsa, Swing, práctica, Theather Art por Fiesta Fiesta 1643- Flesh Satin & Flesh Mesh Zapatillas de mujer ASP Haflinger cascada CLARKS Brier Dolly Dress Pump para mujer Negro sintético , Camper Mujer Bowie K200016 Oxford 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.

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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 Bomba de vestido mujer Pointe para 11637 mujer Easy B01MRX35SY Street Patente desnuda e052c60 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.

Zapatillas
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.