A 2D shape with forty sides is known as a tentracontagon.
That shape is called a triangular prism. A prism is made of rectangles arranged in a tube with any 2D shape at the ends. This shape determines what kind of prism it is, you can get pentagonal, hexagonal, and many other types of prism.
Its called a HEPTAGON
its called a septagon
A semi-circle.
An icosahedron is a polyhedron has 20 faces, and is a 3D shape.
A 2D shape does have one face.
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
A twenty sided, 2D figure is called an icosagon.
A hexagon
A polygon with 20 sides is called either a 20-gon or an icosagon.
-5
a 2d shape can only ever contain 1 face!
No. A 2d shape is a plane area, which may be regarded as a face, which is bounded by a side or sides.
I think they all have 1.... because 2d shapes are flat!!! :)
A 2d nine sided shape is called a nonagon.
if its 2D its a octagon, if its 3D its a octagonal prisim