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Proposed Problem 80. Area of a triangle, side, incircle, inradius.
"The Area of a Triangle inside the Incircle" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheAreaOfATriangleInsideTheIncircle/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Proposed Problem 66: Triangle, Excircle, Tangents, Geometric Mean.
"Tangents to an Excircle" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TangentsToAnExcircle/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez 

Triangle: Incircle, Perpendicular, Angle Bisector, TracenPoche

Triangle: Incircle, Perpendicular, Angle Bisector.
Using Tracenpoche Interactive Geometry Software.
"An Angle Bisection" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/AnAngleBisection/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Triangle, Angle Incircle, Incenter

Proposed Problem 52: Triangle, angles, incircle.
"A Congruent Angle inside the Incircle" from The Wolfram Demonstrations Project: http://demonstrations.wolfram.com/ACongruentAngleInsideTheIncircle/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Archimedes: Proposition 2 Semicircle, diameter, tangents, secant line.
"A Lemma of Archimedes about a Bisected Segment" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/ALemmaOfArchimedesAboutABisectedSegment/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez 

Archimedes: Proposition 12 Semicircle, Diameter, Chords, Tangents, Perpendicular.
"Tangent Points on a Semicircle" from The Wolfram Demonstrations Project"
http://demonstrations.wolfram.com/TangentPointsOnASemicircle/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Triangle, Cevian, Incircles, Tangents

Problem 32. Triangle, Cevian, Incircles, Tangents.
"Incircles and a Cevian" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/IncirclesAndACevian/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Quadrilateral Area, Elearning.

Proposed Problem 98. Quadrilateral Area, Centroid, Similarity.
"The Quadrilateral of Centroids" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheQuadrilateralOfCentroids/
Contributed by: Jay Warendorff
 After work by: Antonio Gutierrez

Archimedes: Proposition 13
Circle, Diameter, Chord, Perpendicular, Congruence.
"Perpendiculars to a Chord" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/PerpendicularsToAChord/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Archimedes Proposition 1.
Tangent circles and parallel diameters
"Tangent Circles and Parallel Diameters" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TangentCirclesAndParallelDiameters/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Elearning: Triangle, Circle, Incircle, Radius

Proposed Problem 160. Triangle, Incircle, Incenter, Circumcircle, Circumcenter, Inradius.
"The Line through the Incenter and Circumcenter" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheLineThroughTheIncenterAndCircumcenter/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Triangle Elearning 159

Proposed Problem 159. Distances from the Circumcenter to the Incenter and the Excenters.
"The Distances to the Incenter and Excenters from the Circumcenter" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheDistancesToTheIncenterAndExcenters
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Elearning triangle 157

Proposed Problem 157. Distance from the Circumcenter to the Excenter.
"The Distance from the Circumcenter to an Excenter" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheDistanceFromTheCircumcenterToAnExcenter/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Elearning triangle 156

Proposed Problem 156. Triangle, Circumradius, Exradius, Chord, Secant line.
"The Product of the Circumradius and an Exradius" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheProductOfTheCircumradiusAndAnExradius/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Problem 118

Proposed Problem 118. Area of triangle, incenter, excenter, tangent.
"Another Relation between the Areas of Triangles Associated with an Excircle" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/AnotherRelationBetweenTheAreasOfTriangles
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Elearn 119: Triangle area.

Proposed Problem 119. Area of triangle, incenter, excircle, tangent.
"On the Areas of Triangles Associated with an Excircle" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/OnTheAreasOfTrianglesAssociatedWithAnExcircle/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Trapezoid, Diagonals, Midpoints

Trapezoid, Triangle, Diagonals, Midpoints.
Using Tracenpoche Interactive Geometry Software.
"Two Midpoints of a Trapezoid" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TwoMidpointsOfATrapezoid/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Geometry Problem 136

Proposed Problem 136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points.
"Three Concyclic Sets of Points Associated with the Orthic Triangle" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/ThreeConcyclicSetsOfPoints
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Geometry problem 143

Proposed Problem 143. Four Triangles, Incircle, Tangent and Parallel to Side, Circumradii.
"The Sum of the Circumradii of Three Subtriangles" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheSumOfTheCircumradiiOfThreeSubtriangles/
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Elearning 142: Triangle area

Proposed Problem 142. Four Triangles, Incircle, Tangent and Parallel to Side, Areas.
"The Sum of the Square Roots of the Areas of Three Subtriangles" from The Wolfram Demonstrations Project:
http://demonstrations.wolfram.com/TheSumOfTheSquareRootsOfTheAreas
Contributed by: Jay Warendorff
After work by: Antonio Gutierrez

Generating Lissajous Figures 

Generating Lissajous Figures with Wolfram Mathematica.
Video and News

Software Index

Software Index.

Solid Geometry

Dynamic Geometry.

Geometry Expressions

Geometry Expressions.

 

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