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Recent Additions (Page 77 of 80)






Archimedes' Book
of Lemmas. Exercise your brain. Archimedes wrote the "Book of
Lemmas" more than 2200 years ago. Solve these 15 high school level
problems and lift up your geometry skills. 


The Quipu:
Caral, Ancient Peru city reveals 5,000yearold 'writing'.
Puruchuco: Knotty Incan Accounting
Untangled.



Experiencing Geometry Poem. Taken from "Experiencing Geometry on
Plane and Sphere," a classic textbook on Euclidean and nonEuclidean
space. Used by permission of the author David W. Henderson. 


The Nazca Lines
are over 300 drawings on the ground (lines, triangles, trapezoids,
spirals, birds, a spider, a monkey, flowers) located in the Nazca
desert.



Nazca Lines: The Monkey  Puzzle.



Nazca Lines:
The Condor bird.
Puzzle: 40 pieces of birds tessellation. 


Nazca Lines: The Spider.
Puzzle: 44 pieces in a tridove style of piece. 


Geometry Quotes
Quiz. Who said this? Five random questions. 


Nagel Point
Theorem. Proof.



Puzzle of the Nagel Point: 22 pieces of polygons. 


Nagel Point
Theorem  Flowchart Proof .



Semiperimeter and excircles of a triangle.



Semiperimeter and incircle of a triangle. 


Semiperimeter, incircle and excircles of a triangle.



Gergonne Point Theorem. Concurrency.
Interactive proof with animation.
Key concept: Ceva's Theorem.



Ceva's Theorem.
Concurrency. Interactive proof with animation. Key concept:
Menelaus Theorem.



Puzzle of the Ceva's Theorem: 48 classic piece. 
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