A hexahedron is two triangular pyramids with their bases glued together.
A two dimensional figure with 6 sides is a hexagon. 3d=>hexahedron
A hexahedron in the form of a triangular bipyramid: two triangular pyramids stuck together.
One is a cuboid. The other is a shape with two pentagonal shapes that meet along one edge. Along the next edges, one on either side is a triangular face. And on the further two sides of the pentagon are trapezium faces. I am not aware of a name for this shape other than hexahedron, which does not distinguish it from a cuboid.
A ditetrahedron (two triangular pyramids stuck together base-to-base) or, more boringly, a cube.
sphere, tetrahedron, hexahedron, heptahedron, decahedron are some.
A hexahedron is two triangular pyramids with their bases glued together.
A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.
A two dimensional figure with 6 sides is a hexagon. 3d=>hexahedron
A hexahedron is a three-dimensional geometric shape having six sides; a hexagon is a two-dimensional six-sided shape.
A hexahedron in the form of a triangular bipyramid: two triangular pyramids stuck together.
One is a cuboid. The other is a shape with two pentagonal shapes that meet along one edge. Along the next edges, one on either side is a triangular face. And on the further two sides of the pentagon are trapezium faces. I am not aware of a name for this shape other than hexahedron, which does not distinguish it from a cuboid.
A 6-sided shape is one kind of polygon. It can also be called a hexagon.
A ditetrahedron (two triangular pyramids stuck together base-to-base) or, more boringly, a cube.
oblong shape and quadrilateral
The shape of one of the two parallel bases.The shape of one of the two parallel bases.The shape of one of the two parallel bases.The shape of one of the two parallel bases.
A Cube or Hexahedron