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

Suela de cuero

Talón mide aproximadamente 2.75

Poca bomba de talón

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

Bomba de Moda vestir Berlin-Su B01K01GHLE de mujer Bomba Pelle Moda Medianoche 1007649Updated 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.

Bomba de Moda vestir Berlin-Su B01K01GHLE de mujer Bomba Pelle Moda Medianoche 1007649

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

Chancleta Yoga Sling 2 Sanuk para mujer Cheetah marrón , Sandalias de pescador lisas Vintage Ariel de Dr. Martens para mujer Negro J Slides Women s Ellie Sandal Broncearse , Easy Spirit - Sandalias informales para mujer, Everso Negro , CLARKS Sandalia Arla Primrose para mujer Tela roja jaspeada , Sandalia Therafit Charlotte con relieve en relieve para mujer para fascitis plantar / dolor en el pie Armada , Sandalia de tira de Ghillie Bre-Italy Bella Vita para mujer Cuero de ante taupe SJP de Sarah Jessica Parker Mujer Meteor Sneaker Silver Glow Sam Edelman Women s Slide Sandalia Denim Blue , Entrenador de Mujeres Cassidy Melón Cuero , Sandalia de mujer de nivel medio Aerosoles Tela negra , Aerosoles Women s Obstachle Course Gladiator Sandal Rosa / Metálico Bota Cami Alegria para mujer Tile Me More Pewter , Caja amarilla para mujer Sullivan gris L Artiste de Spring Step Women s Style Myah Leather Sandal Black Multi , Sandalias EVA Gizeh de mujer Birkenstock Eva blanca , Chaco Mujer Zcloud 2 Sport Sandalia Verdure aguacate , CLARKS Womens Un Reisel Myra Slide Sandal Cuero Sage Sandalias de diapositivas casuales Easy Street Womens Conca Fabric Open Toe Tela elástica blanca Sandalias de cuero de Viv Viv de TOMS Natural Metálico , Sandalias de cuero de Viv Viv de TOMS Chambray negro texturizado Sandalia Drew Cascade para mujer Denim Blue Nubuck Sandalia de cuña de Easy Street para mujer Whisky Sandalia Lorelle para mujer Spring Step Cuero blanco , Sandalia Miel Mooz para mujer Rosa Sandalia Sunkiss Cara de Sperry Top-Sider para mujer Armada Sandalia CLARKS Wave Grip para mujer Sabio , Sandalia Gigi de Naturalizer para mujer Mármol suave , Sandalia de mujer Teva Verra Orquídea púrpura ,

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 Kids Air Max Zero Essential GS Negro / Blanco / Rosa , Zapatillas de running Reebok para mujer Zprint Her Elle MTM Gris Ceniza / Carbón / Vitamina C / Blanco , Chaco Women s ZX2 Classic Athletic Sandal Credo Golden Zapatillas de senderismo adidas AX2 CP para mujer Ch Gris Sólido / Vapor Azul / Gris Cinco , Zapatillas de running NIKE Air Zoom Vomero 12 para hombre Negro / Blanco / Antracita , Chaco Mujer ZX1 Classic Sport Sandalia Negro Brooks Womens Revel Joyous Mint / Pink / White , Zapatillas de trail WT10V4 para mujer New Balance Libélula , Zapatos OLUKAI Pehuea - Mujer Negro Negro Birkenstock Arizona Sandalia de cuero unisex Cuero Habana Aceitado , Entrenador de Mujeres Cassidy Melón Cuero , Kate Spade New York Women s Ivonna Sandal Lienzo de rayas azul marino / crema , Steve Madden Womens Joani Broncearse , Easy Spirit Women s Traveltime Mule Stone-medium Blue-leaf , Zapatillas NIKE Zoom para hombre Stefan Janoski Skate Seguir Red / Obsidiana Converse Chuck Taylor All Star Seasonal Canvas High Top Sneaker azul , Sam Edelman Women s Bay Slide Sandal Marfil negro / negro Sandalia de diapositivas de ocio para mujer de Seychelles Oro rosa , Sandalia Aqua Slide de Marc Jacobs Women s Love Fuchsia Multi ALMA NATURAL Sandalia Kiki Slide para mujer Negro , Sandalias Jerusalem Sandalia Nuri Slide Azul Twisted X Ladies Brown / Purple Zapatos casuales marrón Zapatilla Sanna Donna Hemp Chill para mujer Natural Zapatillas de ciclismo Northwave Sonic 2 2016 Negro , Bota Kikka para mujer Dromedaris Negro Bomba Candra para mujer Bandolino Armada Hush Puppies BAB Felise Ante negro , Botas de campo acolchadas TuffRider Ladies Alpine en piel sintética - , Trask Womens Ali Haircalf negro Sandalia de gamuza Poppy de TOMS para mujer Cuero miel

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 Bomba de Moda vestir Berlin-Su B01K01GHLE de mujer Bomba Pelle Moda Medianoche 1007649 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

For email to reach me, the word