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The icosahedron is the shape that has 20 sides. The icosahedron also has five triangular faces that join together at each vertex.
Twenty
It has 20 faces.
An Icosahedron has 20 triangular sides. yay
A icosahedron.
Icosahedron
Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.
An icosahedron has 20 sides, so 5,000,000 icosahedrons have 100,000,000 sides.
Look up on line in the Free Dictionary by Farlex. Shows a picture of the 20-sided icosahedron in which it appears that the top and bottom have 5 sides each and the center has 10 sides.
Pentadecagon; Pentakaidecagon