Can you name the 3-dimensional shape with 20 congruent triangles as faces?

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It is called an Icosahedron. An example could be the 20-sided die, if you have seen those before.
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Name of a 20 faced shape?

yeah umm its called an iscohedron! i reckon its quite hard to spell! i luv cows so much cya later good luck with stuff! from somebody i cant say just to be sure. mwahahaha
In Math and Arithmetic

Which 3 dimensional figure has faces that are always congruent and the same shape?

There are a few families of polyhedra with identical faces. There are none whose faces have 6 or more sides. There is no special name for polyhedra whose faces are pentagons