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Icosigon

Q: 20 sided shape

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A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.

Any of these shapes is practically circular. A 20-sided shape is an icosagon. a 50-sided shape is a pentacontagon (aka pentecontagon). A 100-sided shape is a hectogon (aka hecatontagon). A 1000-sided shape is a chiliagon.

An icosagon

Regular 20 sided solid is an icosahedron, so a plane equivalent is presumably an icosagon?

There are 20 triangles inside a 22 sided polygon

Related questions

A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.

Any of these shapes is practically circular. A 20-sided shape is an icosagon. a 50-sided shape is a pentacontagon (aka pentecontagon). A 100-sided shape is a hectogon (aka hecatontagon). A 1000-sided shape is a chiliagon.

the name of a 20 sided 3d shape is called a icosahedron

An icosagon is the name of the 20 sided polygon.

icosagon

A 20 sided shape.

A 20-sided shape is called a dodecahedron.

10 sided 2D shape is called a decagon 20 sided 2D shape is called a icosagon 30 sided 2D shape is a swimming pool 40 sided 2D shape is unknown 50 sided 2D shape is unknown 60 sided 2d shape is unknown 70 sided 2d shape is unknown 80 sided 2d shape is unknown 90 sided 2d shape is unknown 100 sided 2d shape is unknown 110 sided 2d shape is unknown 111 sided 2d shape is unknown 120 sided 2d shape is unknown 130 sided 2d shape is unknown

Yes. It is an icosahedron.

A 5 sided shape is a pentagon. Its perimeter has no relevance.

With a pencil and paper

its a icosahedron