pyramid
The tetrahedron has 4 equilateral triangles as its faces.
Two. 4 faces are triangles and the base is a square.
A truncated tetrahedron.
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
pyramid
The tetrahedron has 4 equilateral triangles as its faces.
A tetrahedron; a shape made of four triangles.
Two. 4 faces are triangles and the base is a square.
A triangle based pyramid.
A truncated tetrahedron.
pyramid
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
pyramid
square based pyramid
A triangular prism
A triangular prisim (3 faces on sides, one face on bottom).