Regular 20 sided solid is an icosahedron, so a plane equivalent is presumably an icosagon?
A 20-sided flat figure (polygon) is called an icosagon. If it is a solid figure--three-dimensional--it is an icosahedron.
An icosagon
A polygon with 20 sides is called either a 20-gon or an icosagon.
A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.
Regular 20 sided solid is an icosahedron, so a plane equivalent is presumably an icosagon?
A 20-sided flat figure (polygon) is called an icosagon. If it is a solid figure--three-dimensional--it is an icosahedron.
A 3D 5 sided shape is called a dodecahedron. It is a solid with 20 vertices, 30 edges and 12 equal pentagonal triangular faces.
the name of a 20 sided 3d shape is called a icosahedron
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
An icosagon
icosahedron
There are separate geometric solids defined by sides:rhombic icosahedron (20-sided planar oblate spheroid shape)rhombic dodecahedron (12-sided planar solid)The icosidodecahedron (with 32 sides: 20 triangles and 12 pentagon faces) has the 30-sided rhombic dual shape called the rhombic triacontahedron.
A polygon with 20 sides is called either a 20-gon or an icosagon.
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A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.