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.

Zapatillas de running Altra AFW1837F 19534 para mujer Torin 3.5 3.5 para Rosado caa73f6




Mesh-Synthetic
Imported
Completely remodelado superior con integrado lengua
Más malla transpirable
sintético Nubuck Heel
Stack Altura: 28 mm
Amortiguación: Moderar
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


Zapatillas de running Altra AFW1837F 19534 para mujer Torin 3.5 3.5 para Rosado caa73f6 - 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

Zapatillas de running Altra AFW1837F 19534 para mujer Torin 3.5 3.5 para Rosado caa73f6

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.


Zapatillas de running Altra AFW1837F 19534 para mujer Torin 3.5 3.5 para Rosado caa73f6

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 NIKE Airstream Sequent 3 para mujer Negro / antracita , Zapatillas de running PUMA Women s Speed ​​500 Ignite Tobillo-Alta rojo , Brooks Womens Adrenaline GTS 18 Ébano / plata / rosa , Zapatillas de running Nike Kaishi para hombre Negro Zapatillas de running TOPO FLI-Lyte 2 para mujer Coral / Aqua , NIKE Women s Tanjun Partícula rosa / blanco Nike Men s Air Presto Essential Blustery / Terra Orange Zapatillas de running Fresh Life Arishi V1 para mujer New Balance Gris oscuro , Calzado deportivo New Balance para mujer Vazee Rush v2 Negro / Plata Zapatillas de running Nike Kids Air Max Zero Essential GS Negro / gris antracita-cool , Zapatillas de running NIKE RN Motion FK 2017 para mujer gratuitas Glacier Blue / Vast Grey / Pure Platinum Calzado deportivo New Balance Vazee Urge v1 para mujer Púrpura / amarillo Calzado de running Ryka Ultimate Form para mujer Negro / Plata , Zapatillas de running GT-3000 5 Performance para mujer ASICS - T755N.9611 Gris / Gris / Canteloupe , Zapatillas de running adidas Alphabounce Em W para mujer Easy Coral / Black / Easy Orange , Zapatillas para correr Mizuno Women s Wave Paradox 3 Gris-rosa , Zapatillas de running definitivas Ryka para mujer Gris negro , Brooks Womens Adrenaline GTS 18 Azul marino / verde azulado / menta Zapatillas de running Reebok Print 2.0 para mujer Nube gris / azul cielo / negro / azul gable / blanco / plata Zapatillas de running W1540V2 New Balance para mujer Blanco azul , Zapatillas de running New Balance 990v4 para mujer Dark Mulberry Skechers Performance Women s Go Run 400 Obstruct Rosa caliente , Zapatillas para correr ASICS Gel-Venture 6 para mujer Negro / Island Blue / Pink Zapatillas para correr Altra Women s Torin 3.0 Azul / Coral , Zapatillas de running NIKE para mujer Lunarepic Low Flyknit 2 Negro / Blanco-negro-corredor Azul , Zapatillas de running Saucony para mujer Omni 16 Teal / Citron Zapatillas para correr Nike Women s Free Rn Distance 2 Hyper Violet / White Dark Iris Zapatillas de running NIKE Zooms Winflo 4 para mujer Antracita / gris oscuro / negro , Saucony Women s Guide 10 Zapatillas para correr Azul claro / azul
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 Wolky Comfort Jewel Choque de Multi Picasso Zapatillas NIKE Femenil Flex 2016 Rn Running Wolf Gray / White / Hyper Violet / Concord Zapatillas de running Saucony Women s Triumph ISO 4 Azul marino / menta Zapatillas de running Adidas Performance Ultra s Boost M para hombre Medium Heather gris / Medium Gray Heather / Dark Heather gris , Zapatillas NIKE Tanjun Prem Sneaker para mujer Pure Platinum / Pure Platinum , Top corto de mujer Saucony Bullet Dalia Brooks Womens Ravenna 9 Azul marino / azul / verde Sandalia Savannah de Ryka para mujer Beet Red / Hyper Pink , Zapatillas de running adidas Women s Cf Racer Tr W, mujer Blanco / blanco / plata mate Zapatillas de running New Balance para mujer 590v3 Negro / rosa Zapatillas para caminar Propell Mujer Travellite MJ Gris pardo Sandalias KEEN Rose City T Strap para mujer Negro / concha de tortuga DAWGS Womens Arch Support Z Sandals Lima suave Sandalia de vestir de cuero Gona de Nine West para mujer Blanquecino Under Armour Threadborne Push para mujer Midnight Navy (410) / Bayou Blue , Zapatillas de baño Skechers Performance para mujer Go Step-Seashore Negro JBU by Jambu Women s Gwen Rain Shoe Cazador , Zapatos de golf AsJei para mujer FootJoy Blanco Sandalia Dolce Vita Halle Slide para mujer Tela natural / negra , Sandalia plana deslizante trenzada metálica Soludos para mujer Nude / Pale Gold , Bota de vaquero western Ariat Women s Heritage Roper Negro Mocasines casuales Alpargata Deconstructed de TOMS para mujer Henna Red Washed Twill Zapato Spike cruzado para mujer ASICS Hyper-Rocketgirl SP 6 para mujer Naranja / blanco / violeta oscuro , Arcopedico Mujeres L8 Gamuza violeta Botines de cuero Patricia de COACH para mujer Negro , Jeffrey Campbell Botines de ante Cromwell para mujer Negro apenado Marc Fisher LTD Womens Karri Tela multi negra Bota Teegan para mujer Caterpillar Roya femenina Trask Womens Ali Piel de oveja lavada italiana de la teca CLARKS Mujer Ashland Bubble Slip-On Cuero marrón

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.

Zapatillas de running Altra AFW1837F 19534 para mujer Torin 3.5 3.5 para Rosado caa73f6 - 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 Zapatillas de running Altra AFW1837F 19534 para mujer Torin 3.5 3.5 para Rosado caa73f6 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 2483291
9775116
10412480
11688860
12470675
15045062
17449746
18327027
18632218
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.