Q: Names of a 20 sided polygon?

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A 20 sided polygon is an 'icosagon'

Icosahedron is a 20 sided polygon.

A 20 sided polygon

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

The interior angles of a 20 sided polygon add up to 3240 degrees

Related questions

N-gon is the name of 13-20 sided polygon.

I suggest you forget about memorizing fancy names - which really serve no useful purpose - and just call them "20-sided polygon", "21-sided polygon", etc.

Duodecagon <--wrong... a duodecagon is a 12-sided polygon. icosagon is a 20 sided polygon.

A 20-sided polygon is an icosagon.(see related link)

A 20-sided polygon is called an icosagon.

The name of a 20 sided polygon is Icosagon.

The name of a 20 sided polygon is Icosagon.

An 11 sided polygon is a hendecagon and a 12 sided polygon is a dodecagon

The name of a 11 sided polygon is Hendecagon.

A 20 sided polygon is an 'icosagon'

The term for a 21 sided polygon is an icosikaihenagon. Icosi is the Greek for the numerical 20 and henagon means 1.

see related link below to see the 20 sided polygon