A hexagon...
Pyramids have some triangular faces.
PYRAMID
No, a dodecahedron is a 3-dimensional shape. Some of the 6.4 million topologically distinct dodecahedra have only triangulat faces, there are many more in which some faces, but not all, are triangular.
A cuboid.
A shape that has some triangular faces is a pyramid.
A hexagon...
pyramid
A tetrahedron.
There are infinitely many polyhedra with one or more triangular faces.
Pyramids have some triangular faces.
Pyramids.
PYRAMID
No, a dodecahedron is a 3-dimensional shape. Some of the 6.4 million topologically distinct dodecahedra have only triangulat faces, there are many more in which some faces, but not all, are triangular.
A Pyramid is a 7 lettered 3D shape with triangular faces.
A cuboid.
In 2 dimensions, a heptagon. In 3 dimensions a hexagonal pyramid, a pentagonal dipyramid and some other exotic shapes - eg shape with one triangular base and one quadrilateral base and miscellaneous faces joining them.