There is no polyhedron with only three sides - a polyhedron being a 3-D shape with plane sides. Once you remove the restriction of plane sides you get several options, some of which are:
A cylinder or a cylindrical shape with partial spheres at each end (like a medicine capsule).
A segment of a torus (a doughnut with a chunk cut out of it).
A spherical wedge - like a segment of a round cheese (that is, real cheese, not the processed plastic that some people consider cheese).
Chat with our AI personalities
a henagon is an 11 sided 2-D shape and a 3-D is called an hendecahedron.
NO!!! It is a seven(7) - sided 2-dimensional polygon. A Heptahedron is a seven(7) -sided 3-dimensional object.
A dodecahedron is a 3-d shape with 12 faces that are regular pentagons.
A 5-sided 2-dimensional figure is a pentagon and a 5-sided 3-dimensional shape is a pentahedron.
A rhombus is a four sided polygon, a quadrilateral. It is a 2d shape. 2d shapes have 2 dimensions, like length and width. 3d shapes have 3 dimensions, like length, width and depth.