A cuboid douses have 8 verticess and 12 edges.
There cannot be a solid three sided figure. A solid 4 sided object is a tetrahedron.
tetrahedron
a tetrahedron
There is no solid figure with only four edges. The smallest solid figure is the tetrahedron, made up of four triangular faces, but it has six edges.
There is no such figure.
pyramid
rectanger
rectangular pyramid
A tetrahedron or triangular pyramid.
rhombus
square