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.

Hecho por el hombre, malla

importado

GEL-Cumulus & reg; 20 zapatillas para correr es un ganador probado eso garantiza un viaje suave cada ¡tiempo!

Sucesor al Gel-Cumulus 19.

Soporte Tipo: Neutro.

Amortiguación: Alta energización Amortiguación.

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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

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

Zapato de running 20 ASICS GEL-Cumulus 20 running para mujer Azure// Blue Print 87b21a7Updated 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:

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.

Zapato de running 20 ASICS GEL-Cumulus 20 running para mujer Azure// Blue Print 87b21a7

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 New Balance 990v4 para mujer Lago Azul / Lago Azul Zapatillas de running definitivas Ryka para mujer Frost Grey / English Rose / Chrome Silver Skechers Performance Women s Go Run 400 Obstruct Azul marino / Aqua , Zapatillas de running adidas Ultraboost W para mujer Misterio Rojo / Misterio Rojo / Rosa Táctil , Zapatillas para correr New Balance Rushv3 para mujer Piscis / Pigmento , NIKE Women s Tanjun Iced Jade Aurora verde blanco , Zapatillas para correr Nike Women s Free Rn Flyknit 2017 Gris pardo / Vino de puerto-solar rojo NIKE Men s Benassi Just Do It Athletic Sandal Midnight Navy / Windchill Nike Men s Air Presto Essential Universidad / Rojo / Negro / Negro , Calzado de carretera Inov-8 Road-X-Treme 250 Gris / Negro / Rojo , Pantalón largo clásico NIKE Golf para mujer Tech Essentials Binario Azul / Blanco-azul Luna , Zapatillas de running Altra AFW1837F para mujer Torin 3.5 Negro , NIKE Women s Revolution 4 Running Shoe Gunsmoke / Ocean Bliss / Dark Grey Adicción a Brooks 12 Ombre Azul / Obsidiana / Púrpura Fucsia Zapatillas de deporte PUMA Mens Fierce Core Lightweight Training Peacoat Zapatillas de running adidas Ultraboost W para mujer Aero Blue S, Aero Blue S, Noble Indigo S , Zapatillas de running NIKE para mujer Epic React Flyknit Perla rosa / rosa perla rosa apenas rosa Zapato de running ASICS GEL-Cumulus 20 para mujer Gris piedra / negro , Nike Hombres Air Zoom Pegasus 33 Wolf Gray / Blanco-cool gris , Zapatillas de running New Balance 990v4 para mujer Verde militar / verde militar , Zapatillas para correr ASICS Gel-Venture 6 para mujer Phantom / Coral / Lima Zapatillas de running New Balance 990V3 para mujer Blanco azul , Zapatillas para correr Nike Women s Free Rn Flyknit 2017 Negro / Blanco-corredor Rosa-gamma Azul , Adicción a las mujeres de Brooks 13 Ébano / Plata / Pagoda Azul , Zapatillas de running Saucony Women s Cohesion TR11 Gris / morado Zapatillas de running NIKE Airstream Sequent 3 para mujer Negro / Blanco-gris oscuro Nike Men s Air Presto Essential Negro , Zapatillas para correr Saucony Women s Excursion Tr11 Gris rosado , Zapato de running ASICS para mujer Torrance Negro / Gris piedra

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 Zapato deportivo ASICS Gel-Cumulus 18 para mujer Acuario / Flash Coral / Blue Jewel Zapato deportivo para acolchado 680v5 New Balance para mujer Cielo azul Converse Chuck Taylor All Star Seasonal Color Hola Radio azul Carro de mujer Brooks Oro Violeta , Converse Chuck Taylor All Star Seasonal Color Hola Inked / Egret Sandalia deportiva Tirra para mujer Teva Negro / Blanco Multi , Skechers Performance Women s The Go 400 Radiance Flip Flop Carbón Zapatillas para correr Mizuno Women s Wave Rider 21 Trébol / blanco Orthofeet Probado Alivio del dolor cómodo Fascitis plantar Piso de mujeres de Coral Pies extra anchos Diabético ortopédico Zapatos atléticos Sneakers para caminar Negro , Prop & eacute; t Zapatillas para caminar TravelFit para mujer Lima / Azul , Zapatillas Skechers for Work Sure Track Trickel Slip Resistant Negro Sandalias Harper Huarache de SoftWalk para mujer Rojo / Tostado Sandalias para mujer TOMS Lexie Open Toe Casual Slingback Desierto de color topo , Sandalia con tachuelas Tali Mini Bow de Cole Haan para mujer Patente negra Zapato de running ASICS GT-1000 6 para mujer Mid Gray / Carbon / Flash Coral Zapatillas de deporte Skechers Performance Go Walk 4 Exceed con cordones para mujer Carbón de leña / Coral , Entrenador campeón Gusto Cross Trainer Black Blk Mesh , Zapatillas de entrenamiento cruzado PUMA para mujer Fierce Core Puma Black-puma Silver , Zapatos de entrenamiento Nike Free TR 6 para mujer Purple Shade blanqueado Lila 502 , Zapatillas de tenis rígidas 996v3 de New Balance para mujeres Pigmento , Sandalia para mujer Layne Slide de Pour La Victoire Negro Sandalia Cato Dolce Vita para mujer Pelo de ternero leopardo TOMS Clásicos de mujer rojo Dualyz Fit Unisex 100% lana Zapato con suela extraíble Gris oscuro / rosa UGG Womens Gracen Whipstitch Negro , Sandalia Birkenstock de cuero Florida para mujer Sfb Black Birko-flor Bos. Moss Oil Suede Zapatilla de cuña de cuero para mujer Jacques Levine 1221 Marfil Botas de moto para adultos Gaerne SG12, blanco, 9 Blanco , Toms Womens Classics Black / Black Canvas 10002472 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.

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 Zapato de running 20 ASICS GEL-Cumulus 20 running para mujer Azure// Blue Print 87b21a7 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.

Sketchpad Gallery These are some of my best sketches. You may find them useful or interesting by themselves.

Geometry Construction Reference

Thirteen elementary straightedge
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4891784

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8497360

12446620

13114712

15274713

16464081

and compass constructions are described and illustrated. The original version,
in Word format, can be downloaded and distributed.

Last update: March 16, 2016 ... Paul Kunkel

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