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.

Sintético

Importado

Caucho único

The Tri N2 es parte de la Proyecto E: Movimiento serie que tiene sido diseñado para proporcionar el la ejecución más suave experiencia; ajuste específico.

Interior es suave como la seda para carreras sin adrenalina comodidad; tiene una copa profunda talón que de forma segura acuna el pie; La suela es de alto kilometraje durable y tiene un patrón de terminal para tracción.

El Tri N2 características nuestra compensación dinámica tecnología para un animado y suave paseo que elimina bofetada en el antepié reduce el choque; El Tri N2 es neutral y tiene una amortiguación entresuela de nivel 2 espesor.

El Tri N2 tiene un bajo 4 mm de caída y una combinación de absorción de impactos y retorno de energía espumas; es liviano, pero suficientemente amortiguado para distancias de Ironman.

Sin costura la parte superior está diseñada para rápido y fácil transiciones con un botín stretch, construcción de encaje de velocidad, y un talón grande pull-loop; dos capas de malla - uno es extremadamente abierto para la transpirabilidad y drenaje mientras el otro está bien Mantente fuera

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

Zapatillas de para running Pearl B00TYO44GO NZUMi W EM 2 Tri N 2 para mujer Rosa eléctrico/ Lima 804f293Updated 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.

Zapatillas de para running Pearl B00TYO44GO NZUMi W EM 2 Tri N 2 para mujer Rosa eléctrico/ Lima 804f293

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

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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 Sandalias Newport H2 de KEEN para mujer Cáñamo / Gorra blanca , Sandalia Unisex Slide de Telic Negro , Calzado de trail running In-X-Talon 212 (S) para hombres Inov-8 Negro / Rojo Correpasillos Merrell para mujer 3 Trail Runner Azalea , Zapatillas de trail running WT10v1 Minimus para mujer New Balance Azul negro , Zapato de running femenino Stinson 3 de HOKA ONE ONE Púrpura , OluKai Miki Li - Mujeres Perla Blush / Pale Gray , Vivien Flat de Bella Vita para mujeres Almond Kid Suede Sandalias planas para mujer Naturalizer Juniper Strappy con punta abierta Cuero de jengibre a presión , CLARKS Lexi Myrtle Sandal para mujer Cuero azul / gris , Zapatillas de running morado sintético Nike Air Max 2016 con punta redonda para mujer , Drew Womens Ariana Dusty Gold , Sandalia de 2 piezas Cobb Hill Women s Hollywood Cuero negro Zapato de entrenamiento cruzado 09v1 New Balance para mujer Gris blanco Converse Chuck Taylor All Star Core Ox Blanco , Zapatillas Superga 2750 Cotu para mujer Azul medio , Zapatillas para tenis Junior All Propulse Fury de Babolat Kid rojo , Zapatillas de golf Skechers Women s Go Golf Birdie Azul / carbón , Zapatillas de golf clásicas híbridas ECCO Women & rsquo; s Blanco / Trooper , Birkenstock Mujer, Madrid Sandalia deslizante Shiny Snake Orange Birko-flor Supra Method Skate Shoe Azul marino / negro blanco , Zapatos de paloma de oro 50 tonos de 1 \ Baile bajo del talón Zapatos de vestir: Mujeres Comfort Ballroom, Latín, tango, salsa, Swing, práctica, Theather Art por Fiesta Fiesta 8881- Sparkle rojo (pedido personalizado, 4-6 semanas de tiempo de proceso) , Así que Danca CH50 Character Shoe con 1.5 Heel Blanco , Ringor Bandit 2.0 Spike- Pitching Rojo blanco Zapatos urbanos de mujer Louis Garneau para mujer Negro / rosa , Bota occidental Everglades SQ de Dan Post para hombre marrón , Easy Spirit Nine West Botines de ante de Hannigan para mujer Dark Natural / Dark Natural Leather , Harley-Davidson - Botas a prueba de agua para motocicleta Rosanne, para mujer Harley-Davidson Zapato de baile Militaire de Bloch Dance Negro Easy Spirit Women s Traveltime Mule Pastel Lila ,

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 Zapatillas de para running Pearl B00TYO44GO NZUMi W EM 2 Tri N 2 para mujer Rosa eléctrico/ Lima 804f293 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