Click the figure below to view the Clawson Point.
Zoom at: Clawson Point
Level: High School, SAT Prep, College geometry
Thursday, June 30, 2011
Problem 630: Clawson Point: Orthic Triangle, Extangents Triangle, Homothecy
Puzzle based on the Clawson Point, Geometry for Kids, Triangle Centers
Interactive Puzzle
Click the figure to solve the interactive puzzle about the Clawson Point: Circumcenters, Concurrent lines
Zoom at Puzzle: Clawson Point
Wednesday, June 29, 2011
iPad Apps: iCrosss, 3D Polyhedron - Video
iPad Apps: Bubble Harp, Geometry for Kids - Video
Bubble Harp was built for the iPhone and iPad with the help of openFrameworks and a Triangle Mesh Generator.
Click the figure below to see the video demo.
iPad, iPhone Apps: Math Shapes, Geometry for Kids - Video
Sunday, June 26, 2011
Triangle Circumcenter by Folding - Software: Tabula
The art of origami or paper folding has received a considerable amount of mathematical study.
Click the figure below to see the video.
Software: Tabula, Triangle Centroid by Folding
The art of origami or paper folding has received a considerable amount of mathematical study.
Click the figure below to see the video.
Software: Tabula, Triangle Orthocenter by Folding
The art of origami or paper folding has received a considerable amount of mathematical study.
Click the figure below to see the video.
Saturday, June 25, 2011
Triangle Incenter by Folding - Software: Tabula
The art of origami or paper folding has received a considerable amount of mathematical study.
Click the figure below to see the video.
Friday, June 24, 2011
Sangaku Japanese Geometry Problems
Click the figure below to see the visual index of Sangaku problems.
Level: High School, SAT Prep, College geometry
Thursday, June 23, 2011
Sol LeWitt: 2D+3D, Walker Art Center 2010 - Video and News
Walker Art Center's Sol LeWitt: 2D+3D Features
Groundbreaking Sculptural and Two-Dimensional Works.
Click the figure below to see the video and news.
Sol LeWitt Interview, New York, 2004 - Video and News
This clip is part of an interview with Sol LeWitt conducted by Stefan Römer. 10/2/2004, New York City.
Click the figure below to see the video and news.
Problem 629: Triangle, Perpendicular to Sides, Intersecting Lines, Altitude
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 629.
Problem 628: Cyclic Quadrilateral, Congruence, Parallel Lines
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 628.
Wednesday, June 22, 2011
Billiard and Geometry - Video and News
Geometry and physics are essential parts of the game of pool/billiards.
Click the figure below to see the video and news.
Problem 627: Cyclic Quadrilateral, Congruence, Concyclic Points
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 627.
Monday, June 20, 2011
Problem 626: Triangle, Distance from the Incenter to an Excenter
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 626.
Sunday, June 19, 2011
McArthur River Uranium Mine, Saskatchewan, Canada, Map and News
McArthur River is the world's largest high-grade uranium mine.
Click the figure below to see the geometry of McArthur River Uranium Mine, interactive satellite map and news.
Zoom at: McArthur River Uranium Mine.
Uranium Mining Operations in the World
Click the figure below to see the index.
Zoom at: Uranium Mining .
Namibia Rossing Uranium Mine, Map and News
Rossing is the world's longest running open pit uranium mine and the third largest producer of uranium oxide globally.
Click the figure below to see the geometry of Rossing Uranium Mine, interactive satellite map and news.
Zoom at: Rossing Uranium Mine.
Kumtor Gold Mine Kyrgyz Republic, Map and News
Located in Tian Shan mountains at more than 4,000 m (14,000 ft) above sea level, Kumtor is the second-highest gold mining operation in the world after Yanacocha gold mine in Peru.
Click the figure below to see the interactive satellite map and news.
Zoom at: Kumtor Gold Mine.
Saturday, June 18, 2011
Problem 625: Triangle, Parallel Lines, Congruence, Angle Bisector
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 625.
Thursday, June 16, 2011
Problem 624: Triangle, Incenter, Excenter, Incircle, Excircle, Similarity
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 624.
Problem 623: Triangle, Incenter, Excenter, Incircle, Excircle, Concyclic Points
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 623.
Monday, June 13, 2011
Rio Tinto Borax Mine in Boron, California, Map and News
One of the richest borate deposits on the planet.
Click the figure below to see the interactive satellite map and news.
Zoom at: Borax Mine Boron, California.
Mining Operations in the World: Rio Tinto - Index
Rio Tinto is a leading international mining group, combining Rio Tinto plc and Rio Tinto Limited.
Click the figure below to see the index.
Zoom at: Mining Operations: Rio Tinto.
Sunday, June 12, 2011
Problem 622: Intersecting Circles, Concyclic Points, Centers, Radii
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 622.
Saturday, June 11, 2011
Online Geometry Problem 621: Two Parallelograms, Diagonals, Centers, Parallel Lines
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 621.
Area de las Figuras Planas: Teoremas y Problemas, English ESL
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice de area de las figuras planas.
Circunferencia Exinscrita: Teoremas y Problemas, English ESL
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice de la circunferencia exinscrita del triangulo.
Incentro del Triangulo, Teoremas y Problemas, English ESL
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice del incentro del triangulo.
Circunferencia, Circulo, Teoremas y Problemas, English ESL
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice de la circunferencia y circulo.
Cuadrado: Teoremas y Problemas, English ESL
Triangulo Escaleno: Teoremas y Problemas, English ESL
Triangulo Equilatero: Teoremas y Problemas, ESL
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice del triangulo equilatero.
Triangulo Isosceles: Teoremas y Problemas
Triangulo Rectangulo: Teoremas y Problemas
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice del triangulo rectangulo.
Mediana del Triangulo: Teoremas y Problemas
Altura del Triangulo, Teoremas y Problemas
Triangulos: Teoremas y Problemas
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice de triangulos.
Problemas de Geometría
Spanish-language version
Version en español.
Nivel: Educacion Secundaria, Academia, Preparatoria, Bachillerato, College.
Hacer click en la figura para ver el indice de problemas en espanol.
Geometría: Teoremas y Problemas
Online Geometry Problem 620: Three Rectangles, Diagonals, Centers, Angles
Thursday, June 9, 2011
Problem 619: Triangle Area, 30 Degrees, Incircle, Incenter, Tangent
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 619.
Problem 618: Triangle Area, 60 Degrees, Incircle, Incenter, Tangent
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 618.
Problem 617: Right Triangle Area, Incircle, Incenter, Tangent, 90 Degrees
Geometry Problem
Level: Mathematics Education, High School, Honors Geometry, College.
Click the figure below to see the complete problem 617.
Problem 616: Parallelogram, Diagonals, Intersecting Lines, Parallel Lines
Geometry Problem
Level: Mathematics Education, High School, College.
Click the figure below to see the complete problem 616.
Tuesday, June 7, 2011
Problem 615: Right Triangle with a Square, Diagonals, Center, Area of Quadrilateral
Geometry Problem
Level: Mathematics Education, High School, College.
Click the figure below to see the complete problem 615.
Monday, June 6, 2011
Problem 614: Parallelogram, Diagonals, Intersecting Lines, Parallel Lines
Geometry Problem
Level: Mathematics Education, High School, College.
Click the figure below to see the complete problem 614.









