In geometry, an icosahedron is a polyhedron with 20 faces. The name comes from ancient greek εἴκοσι, meaning ‘twenty’, and ἕδρα, meaning ‘seat’. The plural can be either "icosahedra" or "icosahedrons". There are many kinds of icosahedra, with some being more symmetrical than others. The best known is the Platonic, convex regular icosahedron.

The 20-sided die you see above could have been built by ancient Egyptian … from an age when casting the dice often had higher stakes than hit points. Made in the shape of an icosahedron (a …

if you changed the shape of the wall to curve in the right way, you could fit different shapes — akin to the the way a soccer ball has pentagonal patches that stitch together. So much like how …

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A 20-sided shape is known as an icosagon. The icosagon is a polygon, and the sum of its interior angles is equivalent to 3,240 degrees. Continue Reading.

… why on earth why would I keep a 20-sided die in my pocket? I don’t even know where I found it. But that line of thinking is what started a flood of wonder. What are the characteristics of this …

A two-dimensional shape with twenty sides is an icosagon.. A three-dimensional object with twenty sides is an icosahedron.

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Rather than being round, this moon is shaped like what mathematicians call an irregular "polyhedron" (a solid object with many plane faces), and what "Dungeons and Dragons" nerds know as a 20-sided …

That’s right, incumbent Larry Enos Jr. and challenger milan “pete” Petrovich rolled a 20-sided die to determine their contest for a seat on the Byron-Bethany Irrigation District’s board. And the die …