Geometry from the Land of the Incas 53/80

Geometry, Machu Picchu

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Recent Additions (Page 53 of 80)

Geometry for Children

Elearning 148

Proposed Problem 148. Quadrilateral, Area, Midpoints.

Elearning 147

Proposed Problem 147. Quadrilateral, Area, Midpoints, Triangle.

Elearning 146

Proposed Problem 146. Varignon's Theorem: Quadrilateral, Midpoints, Parallelogram, Area, Perimeter.

Elearning 145

Proposed Problem 145. Four Triangles, Incircle, Tangent and Parallel to Side, Incenters, Circumcenters.

Pappus Theorem

Pappus Theorem. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.

Elearning 144

Proposed Problem 144. Four Triangles, Incircle, Tangent and Parallel to Side, Inradii.

Elearning 143

Proposed Problem 143. Four Triangles, Incircle, Tangent and Parallel to Side, Circumradii.

Elearning 142

Proposed Problem 142. Four Triangles, Incircle, Tangent and Parallel to Side, Areas.

Elearning 141

Proposed Problem 141. Triangle, Incircle, Tangent , Parallel, Perimeters.

Elearning 140 Triangle area

Proposed Problem 140. Triangle, Excircle, Tangent, Semiperimeter.

Inca Music: Condor Pasa

El Condor Pasa, Mind map.

Problem 139 Triangle area

Proposed Problem 139. Triangle Area, Orthic Triangle, Semiperimeter, Circumradius.

Nagel theorem

Proposed Problem 138. Nagel's Theorem, Orthic Triangle, Altitudes, Circumradius, Perpendicular.

Puzzles Mind Map

Go Geometry Puzzles Mind Map.

Elearning 137

Proposed Problem 137. Orthic Triangle, Altitudes, Perpendicular, Incircle, Collinear Points, Parallelogram.

Elearning 136

Proposed Problem 136. Orthic Triangle, Altitudes, Perpendicular, Concyclic Points.

Elearning 135

Proposed Problem 135. Orthic Triangle, Altitudes, Perpendicular, Parallel.

Elearning 134

Proposed Problem 134. Orthic Triangle, Altitudes, Angle Bisectors, Orthocenter, Incenter.

Gergonne Line

Interactive Gergonne Line and Nobbs Points. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.

Simson Line

Interactive Simson Line. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.

Triangle, Median, Circumcenter

Triangle, Medians, Six Circumcenters Concyclic. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Trapezoid

Trapezoid, Triangle, Diagonals, Midpoints. Dynamic Geometry.
Step-by-Step construction, Manipulation, and animation.
Prove proposition.

Congruence

Congruence. Index..

Similarity

Similarity, Ratios, Proportions. Index.

Areas

Areas Index.

Cube Metamorphosis

The Metamorphosis of the Cube Foldings and Unfolding between Polygons and Polytopes.

Dynamic Geometry Triangle

Dynamic Geometry.
Triangle: Incircle, Perpendicular, Angle Bisector. Prove proposition

Problem 133

Proposed Problem 133.
Triangle, Angle Bisectors, Collinear Points.

Problem 132

Proposed Problem 132.
Triangle, 60 degree, Orthocenter, Congruence, Midpoint.

Inca Trail to Machu Picchu

Survivor: the Inca Trail to Machu Picchu by Doug Johnson
A slideshow based on the author's hike of the Inca Trail.
Machu Picchu Slideshow.

Elearning 131 Van Aubel

Proposed Problem 131. Van Aubel Theorem, Concurrent Cevians, Sum of Ratios.

Elearning 130 Triangle

Proposed Problem 130. Triangle, Concurrent Cevians, Sum of Ratios.

Elearning 129 Cevians Ratio

Proposed Problem 129. Triangle, Concurrent Cevians, Sum of Ratios.

Elearning 128 Incenter

Proposed Problem 128. Incenter of a Triangle, Angle Bisectors, Sum of Ratios.

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