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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Cuero
Importado
Con su diseño intemporal, el Imo-Italia trae la clásica correa doble Sandalia de vuelta a tu armario de verano
Cuero superior
Ligeramente plantilla acolchada
Crafted en Italia
1/2 Altura del tacón
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


Sandalia Bella Cuero Vita IMO-Italia Bella Sandalia para mujer Cuero dorado agrietado 234a7b1 - 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

Sandalia Bella Cuero Vita IMO-Italia Bella Sandalia para mujer Cuero dorado agrietado 234a7b1

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.


Sandalia Bella Cuero Vita IMO-Italia Bella Sandalia para mujer Cuero dorado agrietado 234a7b1

Chinese Handcuffs This has no lesson, only questions. It is just an interesting animated file, which invites student investigation. It has applications for geometry,

Taipán de mujer de David Tate Verona Cordero de plata Vionic Rest Farra - Sandalias de apoyo para mujeres Patente roja Zapatillas OLUKAI Hokua - Hombre Trench Blue / Black Sandalias para mujer TOMS Lexie Open Toe Casual Slingback Ivory Lace Grosgain Slingback de Seleste de las mujeres naturales del alma Cuero negro , Sandalias FitFlop Womens Cova con cordón cerrado Rosado oscuro , Sandalia de gamuza Poppy de TOMS para mujer Cuero miel , Sandalia de Sauce de Mujer Paul Green Cepillado Humo Metálico , Reggae Birko-Flor con Birkenstock Betula para mujeres Blanco básico , Sandalia de cuero Camilia de TOMS para mujer Cuero miel / negro tribal , Vionic Rest Farra - Sandalias de apoyo para mujeres Patente roja Sam Edelman Women s Gigi Marfil moderno , Sandalias EVA Gizeh de mujer Birkenstock Scuba Blue , Vionic Rest Farra - Sandalias de apoyo para mujeres Corcho de oro Teva Alp - Mujeres Helecho , Sandalia Rosa mujer TOMS Cuero miel , La sandalia de gladiador FLEXX Women s Band Together Denim Milos , David Tate para mujer Nelly Broncearse , Sandalia de cuña Cassia de mujer volátil Bronce , Birkenstock Milano Sandalia de Cuero Unisex Brown Birko Flor Zapato de malla Nohea de OLUKAI - Hombre Negro Sandalia Terra FI Lite de Teva para mujer Luces de la ciudad negro pastel Salvatore Ferragamo Womens Belluno Sella , Sandalia de la rabia de la mujer de Steve Madden Diamante de imitación Sandalia Amara 2 de Carlos Santana para mujer de Carlos Esmeralda , KEEN Kids Seacamp Ii CNX Water Shoe Pastel Turquesa Raya BareTraps Sandalia Denni Slide para mujer Melón / trigo , Sandalia de cuña universal W Ysidro de mujer Teva Negro Sandalia de mujer de nivel medio Aerosoles Denim Combo ,
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 Zapatillas de running Nike Zoom All Out Low para mujer Fire Pink Black Bright Mango 600 Zapatillas de running ASICS Gel-Scram 4 para mujer Peacoat / Soft Sky , Zapatillas de running ASES para mujer con puntera de gel Rayo / Púrpura / Lima , Sandalia deportiva NIKE Kawa Slide para hombre Blanco negro , Zapatillas Drew Shoe para mujer Paige Ternero de hueso , Zapatillas de running Kinvara 6 Saucony para mujer Rojo / naranja / menta , Mountain Warehouse Jasmine Womens Sandals -Ladies Summer Walking Shoes marrón , Sandalia de susurro de mujer Keen Beet Red / Honeysuckle , Zapatillas para correr Nike Women s Free Rn Flyknit 2017 TRABAJA AZUL / OSCURO OSCURO-CLORO AZUL , Zapato de Trail Hellcat Boombah para hombres - 14 Opciones de color - Varios tamaños Azul marino / rojo New Balance W880gb6 para mujeres Gris azul Bomba de vestido Lexre Twin Gore de mujer Aravon Black Leathe , Zapatos del Dr. Scholl s Women s Powers Sandal Negro Zapatillas de running NIKE Free Run para mujer - SU16-10 - Blanco Blanco / puro platino / negro , HEAD Women`s Revolt Pro Zapatos tenis blanco y azul cian- (274115WHCB-S15) , Drew Shoe Women s Paradise II Velco Slip-on Gris pardo , Drew Shoe Women s Hope cuero terapéutico moda Oxfords Ante negro BareTraps Women s Cherilyn Slide Sandal champán ALMA NATURAL Sandalia Kiki Slide para mujer Negro Zapato de voleibol Gel-Tactic 2 para mujer de ASICS Glacier Grey / Silver / Dark Grey , Zapatillas de estudio Reebok para mujer Sublite Studio Flame Mid Dance en Ultima Purple / High VIS Green / White , Zapatillas de deporte Vionic para mujeres relajadas Armada BareTraps Women s Bt Rylen Tobillo Botín Whisky Funtasma de Pleaser Women s Lust-3000 Boot Black Str , Egos Copenhagen House Slip on Slippers Verde lima , Zapatillas de deporte lavables Walker Propet para mujer Blanco , Cole Haan Womens Cassidy Transitional Bootie 70mm Cuero negro , Soft Style de Hush Puppies Women s Jaylene Oxford Taupe Nubuck , Zapatos holgazanes Mila de Trotters para mujer Silverwash Metallic Soft Nappa Leather , Total de sobre de movimiento total de Rockport para mujer Misty Alloy Leather ,

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.

Sandalia Bella Cuero Vita IMO-Italia Bella Sandalia para mujer Cuero dorado agrietado 234a7b1 - 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 Sandalia Bella Cuero Vita IMO-Italia Bella Sandalia para mujer Cuero dorado agrietado 234a7b1 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.

Sandalias
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.