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.

Cuero

Importado

Sintético suela

Plataforma mide aproximadamente Pulgadas de 1.0 pulgadas

Cuero superior

Acolchado plantilla moldeada

Cuero forrado

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

Sandalia mujer para mujer Cait Cait Donald J Pliner Pliner Negro 9be8ae4Updated 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.

Sandalia mujer para mujer Cait Cait Donald J Pliner Pliner Negro 9be8ae4

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

Sam Edelman Women s Bay Slide Sandal Denim Blue / New Blue Sandalia Dolce Vita Delana Slide para mujer Cuero rojo Sandalia Dolce Vita Jene Slide para mujer Denim de Ceniza , Sandalia tobogán X-Band con plataforma Mikenzie de Gentle Souls para mujer Seta Mephisto Sandalia mujer Yin Slide Armada Sandalia para mujer Ivanka Trump Earin Slide Ante rojo , Kenneth Cole REACTION Jel-OUS 2 Woven Slip Slip Sandal para mujer Coral Multi Prop & eacute; t Womens Aurora Slide Rubí Sandalia para mujer KAANAS con plataforma tejida Akumal Fucsia Plataforma de campo Leisa para mujeres de CLARKS Cuero negro Circus de Sam Edelman Sandalia de mujer Raquel Slide Plata blanda , Plataforma CLARKS Women s Parram Waltz Cuero negro Sam Edelman Women s Slide Sandalia Pewter / Putty Sandalia Claire para mujer Dolce Vita Cuero natural , Sandalia Estilo Vinny de Charles David para mujer Arena del desierto Plataforma CLARKS Women s Delana Liri Cuero negro , Sandalia plana Kip de Trotters para mujer Armada , Sandalia Rockdale Lanea Woven Slide para mujer Tejido negro Sandalia Dolce Vita Poe Slide para mujer Fuera de cuero blanco Sandalia Ryana Marilyn Slide para mujer Ciruela / blanco , Marc Jacobs Women s Aurora Mule Azul Stuart Weitzman Landslid femenino Ante desnudo Sandalias Sandalias Sandalias Ruth Moldeadas Sandalias Jerusalem marrón Sandalia Victoria Slide de mujer SCHUTZ Tuerca tostada Sandalia plana Dionne de Easy Street para mujer Blanco , Sandalias Jerusalem Sandalias Deborah Slide marrón Sandalia de diametro de moda Manaan de 3 bandas para mujer de KAANAS Gris pardo Sandalia de la diapositiva de Stella de las mujeres de Rachel Zoe Negro Sandalia KAANAS Sausalito Bow Espadrille Slide para mujer Gris

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 Reebok Classic Sneaker Equipo Navy / Platino , Zapatillas de running Gel-Moya para mujer de ASICS Azul blanco Zapatillas de running Brooks Women s Glycerin 16 Road Púrpura / rosa / gris Chaco Women s Z2 Classic Athletic Sandal Florista , Zapatillas de running adidas Adizero Prime Parley Carbono, Blue Spirit S, Ftwr Blanco Zapatillas de running Fila Fresh s Memory Fresh Start 2 Slip Resistant Negro / Negro / Negro , New Balance W880gb7 para mujeres Azul claro , Zapatillas adidas outdoor Terrex AX2R para mujer Misterio Gasolina / Misterio Gasolina / Fácil , Zapatillas de running New Balance para mujer 590v3 Reflection / Vintage Indio , Sandalia tejida Sunvue de Merrell para mujer Coral caliente Zapatilla de pies Cush N de Prop & eacute; t para mujeres Arena Chancleta Yoga Sling 2 Sanuk para mujer Tomate Sandalia de enseñanza Grecian de cuero para adultos, T8900 Broncearse , Sandalias Sunstone para mujer Merrell Negro , Sandalias de mujer Merrell, Sandspur Delta Slide marrón HEAD Nitro Pro Indoor Shoe para hombre Azul , Zapatillas de tenis NIKE Womens Zoom Vapor X Lt. Blue Fury / Multi-color / Bleached Aqua , Zapatos de entrenamiento Nike Free TR 6 para mujer Pink Blast / Negro / Blanco Zapatillas de viaje Propet para mujer Taupe Suede , Converse Chuck Taylor All Star Seasonal Canvas High Top Sneaker rojo Sandalia de la diapositiva de junio de las mujeres de Propet Broncearse Sandalia Otto Slide de mujer Yellow Box Aceituna Sandalia de la diapositiva de Marlowe de las mujeres chinas del lavadero Nude Suede Bota de cuero Foxy W de mujer Teva marrón Mujeres Nacidas - Trinculo gran Cañón Bomba de vestido Pointe para mujer Easy Street Textura negra / negra , FRYE Mujeres Brooke corto interior Zip Tobillo Bootie Negro , Wolky Comfort Lace Up Shoes Holandés Cuero engrasado negro , Zapatillas SAS Women s Tour con cordones Zapato de confort activo Plata Mephisto Womens Iris Marrón oscuro / Bota de peltre ,

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 Sandalia mujer para mujer Cait Cait Donald J Pliner Pliner Negro 9be8ae4 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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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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