An eighteen-sided shape is called an octakaidecagon, or octadecagon.
Only if 2 sides are parallel with each other, and the other two sides are also parallel with each other. All squares are rectangles. All rectangles are parallelograms. All parallelograms are 4 sided. But not all 4-sided are parallelograms, not all parallelograms are rectangles, and not all rectangles are squares.
The names of polygons with 40 sides - Tetracontagon.
A polygon is an unequal six sided shape. A polygon or hexagon is the name used weather the sides are even or not.
10 sided shapes are known as decagons.
A 20-sided shape is called a dodecahedron.
An eighteen-sided shape is called an octakaidecagon, or octadecagon.
Nonagon.
Only if 2 sides are parallel with each other, and the other two sides are also parallel with each other. All squares are rectangles. All rectangles are parallelograms. All parallelograms are 4 sided. But not all 4-sided are parallelograms, not all parallelograms are rectangles, and not all rectangles are squares.
A Pentagon. A five sided figure is a pentagon
The names of polygons with 40 sides - Tetracontagon.
Ah, that's a delightful shape known as a "26-gon." Isn't that just a joy to imagine all those sides coming together in perfect harmony? Just remember, every shape is special and unique in its own way, just like you are special and unique too.
A 1000 sided polygon is called a chiliagon.
A five-sided geometric shape is a pentagon.
It can be a quadrilateral, though quadrilaterals are 4-sided shapes in general.
A polygon is an unequal six sided shape. A polygon or hexagon is the name used weather the sides are even or not.
It's probably a circle, because some people view it as a 0 sided figure, but some people view it as a 1 sided figure.