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Pentagons - Table of Content
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Euclid's
Elements Book I, 23 Definitions. One-page visual illustration.
Euclid's
Elements Book. Index |
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Word
Cloud of Pentagon.
Visual Summary. |
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Euclid's Elements,
Book XIII, Proposition 10 Pentagon, Hexagon, and Decagon. One page visual illustration. |
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Proposition 15.
Circle and regular pentagon. |
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Miquel's Pentagram Theorem
Interactive proof with animation and key theorems.
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Miquel's
Pentagram with Dynamic Geometry.
You can alter the pentagram dynamically
in order to test and prove (or disproved) conjectures and gain
mathematical insight that is less readily available with static drawings
by hand. Requires Java Plug-in 1.3 or higher. Please be patient while
the applet loads on your computer. |
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Pentagon and Lissajous Art
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Proposed
Problem 430.
Circumscribed and Inscribed Regular Pentagon, Perpendicular, Areas. |
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Proposed
Problem 429.
Circumscribed and Inscribed Regular Pentagon, Perpendicular, Measurement. |
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Proposed
Problem 410.
Two Regular Pentagons, Angle. |
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Proposed Problem
342.
Pentagon, Inscribed circle, Tangent, Semiperimeter. |
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Proposed Problem
261.
Regular Pentagon inscribed in a circle, sum of distances.
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Video: Visualization of Solid Tessellations. |
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Teamgeist world cup official ball and
Geometry
Telstar = 12 black pentagons in 20 white
hexagon |
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Experiencing Geometry Poem. Taken from "Experiencing Geometry on
Plane and Sphere," a classic textbook on Euclidean and non-Euclidean
space. Used by permission of the author David W. Henderson.
Pentagons illustration. |
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Proposed Problem
169. Parallelogram, Interior and Exterior Points, Diagonals, Pentagon, Triangles, Areas.
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Proposed Problem
168. Parallelogram, Diagonal, Triangles,
Pentagon, Areas.
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Proposed Problem
225. Viviani's Theorem Extension, Regular Polygon, Apothem, Distance. |
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Geometry Jokes. Matching exercise: Pentagon, Plane, Postulate, Prism, ...
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Geometry for
Children: Shapes (Polygons) Sesame Street. |
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Teaching Geometry and Donald in Mathmagic Land 3/3. |
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Teaching Geometry and Donald in Mathmagic Land
2/3
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Teaching Geometry and Donald in Mathmagic Land
1/3
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Geometry for Children: Polygon Song |
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Interactive Mind Map of the Van Hiele Model of Geometric Thought
Level 0. (Basic Level) Visualization. |
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Index,
Platonic Solids, Interactive animation,
Tetrahedron in the
cube,
Archimedes and the Rhombicuboctahedron with animation,
In the News,
Video: How to make platonic solids with gum drops and tooth
picks |
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Geometry Online
Glossary .
Geometry Glossary based on the new New York State
mathematics standards initiative. |
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Pentagons
& Pentagrams. I found, exploring with dynamic geometry software, new
facts about pentagons and pentagrams. Key concept: Menelaus Theorem.
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Trailer of
FLATLAND: The Movie.
Adapted from Flatland: A Romance of Many Dimensions (1884)
"All Flatland's inhabitants--straight lines, triangles, squares, pentagons, hexagons, and other figures--are trapped in their planar geometry." |
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