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

sku = 307960-108-5.5

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

NIKE s Women B01HH93GFM s 95 Air Max 95 f6a75bdUpdated 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.

NIKE s Women B01HH93GFM s 95 Air Max 95 f6a75bd

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 para mujer Lunarepic Low Flyknit 2 Electro Verde / Negro / Azul Mediano , Zapatillas de tenis ASICS Gel-Game 6 para mujer Plata blanca , Zapatillas para correr Nike Women s Free Rn Flyknit 2017 Negro / antracita , Zapatillas de running EM Road M2 v2 para mujer Pearl Izumi Paloma / Rosa Violeta Zapatillas de running ASICS Gel-Cumulus 19 para mujer Negro / Porcelana Azul / Blanco Under Armour Threadborne Fortis para mujer Gris Nublado (103) / Blanco Zapatillas de running Under Armour para mujer Toccoa Chambray Blue (400) / Overcast Grey , Zapatillas de running Nike Zoom para mujer Hasta / Mtlc Red Bronze / Green Glow , Zapatillas para correr Nike Women s Free Rn Flyknit 2017 Gris pardo / Vino de puerto-solar rojo , Zapatillas de running ASICS Gel-Nimbus 19 para mujer Insignia Blue / Glacier Sea / Crystal Blue Zapatillas de running NIKE Air Huarache para hombre Luz de hueso / piedra pómez , Zapatillas de running NIKE Air Huarache para hombre Hueso de Goma Ligera / Orquídea Amarillo PUMA Men s Roma Basic Sneaker Cuero blanco / negro Zapatillas para correr Mizuno Women s Wave Rider 21 High Rise / Gray Stone Nike Hombres Air Zoom Pegasus 33 Universidad Rojo / Blanco / Negro , Zapatillas de running ASICS GT-2000 6 para mujer Brillante rosa / negro / blanco Zapatillas de running ASICS GEL-Storm 2 para mujer Tormenta / Flash Amarillo / Rosa , Zapatillas de running Nike Air Huarache Run Ultra para hombre Blanco , Zapatillas de running New Balance Boracay V3 para mujer Plata Metálica / Trueno , Zapatillas de running NIKE Air Huarache para hombre Sport Fuchsia / Black-gum Yellow Zapatillas NIKE Kids Revolution 3 (GS) para correr Negro / Plata Metálico / Hiper Rosa / Blanco , Zapatillas de montaña de montaña Akyra La Sportiva para mujer Slate / Jadegreen , adidas Performance Ultraboost X para mujer Gris / Gris / Hi-res Azul Amortiguación 460v2 New Balance para mujeres Azul plateado Zapatillas de correr de espuma fresca New Balance 1080v8 para mujer Indigo vintage / Reflexión Zapatillas de running New Balance Prism V2 para mujer Sea Spray / Water Vapor Zapatillas deportivas para hombre NIKE Lunar Apparent Jade claro de carbono / negro claro Zapatillas de running Under Armour UA Micro G Speed Swift para mujer Harmony Red / White / Sky Blue Nike Hombres Air Zoom Pegasus 33 Blanco / puro platino / negro / gris fresco ,

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 Free Run para mujer - SU16-10 - Blanco Blanco / Negro - Pure Platinum , Zapatillas de running Adidas Performance Ultra s Boost M para hombre Colegial azul marino / azul ceniza NIKE Men s Roshe Run Blanco Blanco Brooks Women s PureFlow 6 Negro / Antracita / Plata , Zapatillas Nike MAYFLY WOVEN para mujer 833802 Negro / gris oscuro / negro Sandalia Yucatan ECCO Mujer Titanio , Orthofeet Verona Comfort Ortopédica Diabética Fascitis Plantar Mujer Sandalia Pescador Earth Origins Sophie Escarlata , Zapatillas de running Reebok Women s Supreme 3.0 MT Nube gris / Caribe verde azulado , Zapatillas de running AMPLICA para mujer ASICS Negro / Negro / Blanco , SOREL Womens After Hours Slingback Lu-negro , Drew Shoe Women s Tulip Comfort Ternero blanco Zapatilla Ascot de hombre UGG Negro / China Tea , Bomba de cuña Lansing para mujer Trotters Ante negro , Zapatillas de paseo Skechers Performance para mujer Go Walk 3 Slip-On Piedra , Nurse Mates Womens - Dash Blanco , Vans Unisex Era Zapatillas de skate, clásicas Low-Top cordones Estilo en Durable Doble costura Lienzo y Original Suela de gofre (Gold Mono) Port Royale Ryka Womens Divya Gris / azul / blanco , Converse Chuck Taylor All Star Core Hola Mono blanco , Sandalia de mujer Frisco Slide de Franco Sarto Multi Zapatos de danza del salón de baile de las señoras muy finas EK9691 con 1.3 \ Satén marrón claro Rebecca Minkoff Women s Alexis Bow Point Toe Flats Rosado , Zol White MTB Indoor Cycling Shoes , Zapato de pista Ld5v5 New Balance para mujer Seafoam / Coral vivo , Bomba de vestido de pasión Easy Street para mujer Nueva Marina , UGG Mujer Dakota Pom Pom mocasín castaña , SeaVees Men s 06/67 Monterey Standard Black 10 D US - Zapatillas de deporte Easy Spirit AP1 Sport Bronce , Birkenstock \ Habana TOMS - Suela de lino de lino clásica, cómoda y de ajuste fácil para mujer (Beige claro)

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 NIKE s Women B01HH93GFM s 95 Air Max 95 f6a75bd 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
687848

1839967

6647711

7347808

8106299

14788973

16048907

16060460

17495769

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