A dodecahedron
octahedron
A pentahedron (eg square based pyramid) or a hexahedron (cuboid), or a heptahedron (a pentagon based prism). There are other shapes.
A shape in fewer than 3 dimensions.A shape with one or more curved faces or edges.
A heptahedron is one possible answer.A heptahedron is one possible answer.A heptahedron is one possible answer.A heptahedron is one possible answer.
A prism *always* has 2 bases. In case you meant "faces" instead of "bases", the prism with the smallest number of faces is the triangular prism - which has 5 faces. If there were any fewer number of faces, the prism which become a two dimensional object.
octahedron
Hexahedron
Prism.
A pentahedron (eg square based pyramid) or a hexahedron (cuboid), or a heptahedron (a pentagon based prism). There are other shapes.
cubes, prisms, dodecahedrons...
An icosahedron is a shape with 20 triangular faces - not more nor fewer. It can, therefore, have only 20 tall isosceles triangular faces.
An icosahedron is a shape with 20 triangular faces - not more nor fewer. It can, therefore, have only 20 short isosceles triangular faces.
Any member of the prism family.
Any polyhedron other than a pyramid.
Tetrahedron- (4 faces, 4 vertices) Octahedron- (8 faces, 6 vertices) Cube- (6 faces, 8 vertices)
According to the Euler characteristic which applies to all simply connected polyhedra,# edges + 2 = # vertices + # faces. So the answer is 2 fewer.
A shape in fewer than 3 dimensions.A shape with one or more curved faces or edges.