The answer below is seriously incorrect. In icosahedron is a polyhedron which is a 3-dimensional object. A polygon is a 2-dimensional object and the 20-sided version is called an icosagon.

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A icosahedron.

A polygon with 20 sides is an icosagon.

A polygon with 1,000 sides is known as a chiliagon. A hectogon is a polygon that has 100 sides, and a polygon with 8 sides is called an octagon.

It has 360/20 = 18 sides

a polygon with 12 sides is called a.. dodecagon

A polygon with 12 sides is called a dodecagon.

A polygon with 5 sides is called a pentagon.

A regular polygon

an Irregular Polygon

the 11th sides of polygon is called UNDECAGON....... the 12th sides is DODECAGON.....

A polygon with 27 sides would be called an icosakaiheptagon.

There is no such figure as a 20 degrees polygon.

There is a corresponding side to every angle. 20... A polygon has as many sides as it does angles.

It is known as a regular polygon that has equal sides of the same lengths.

There is no such polygon but if you meant exterior angles of 20 degrees then it will have 360/20 = 18 sides

icosagon

dodecahedron

Icosagon

A cyclic polygon.

Just call it a "24-sided polygon".

Any polygon has 3 or more sides

The minimum number of sides for a polygon is 3 sides.

A polygon with four equal angles and sides is a square.

A polygon with n sides had n*(n-3)/2 diagonals. So a 20 sided polygon would have 20*17/3 = 170

There's no such thing as a two-sided polygon. In order for a shape to be a polygon, it has to have at least three sides.