An octahedron.
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
A cube always has six congruent faces and eight vertices.
The Platonic solid known as an octahedron would fit the given description
A tetrahedral prism is a three-dimensional geometric shape that has two congruent triangular bases and four congruent lateral faces that are in the shape of triangles. The lateral faces connect the corresponding vertices of the two triangular bases, forming a solid with six faces, eight edges, and four vertices.
A cube.
octahedron
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
A cube always has six congruent faces and eight vertices.
...CUBE hAS 6 CONGRuent faceS ,8 vertices and 12 EDGES
Isosceles TetrahedronA solid with four faces is a tetrahedron. Each of the faces is a triangle. If all the triangles are congruent, you have an isosceles tetrahedron.
They can have faces which are triangles, quadrilaterals, pentagons, hexagons or heptagons. It has 8 faces and can have 6 to 12 vertices.
Icosahedron
The Platonic solid known as an octahedron would fit the given description
A tetrahedral prism is a three-dimensional geometric shape that has two congruent triangular bases and four congruent lateral faces that are in the shape of triangles. The lateral faces connect the corresponding vertices of the two triangular bases, forming a solid with six faces, eight edges, and four vertices.
Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.
A cube.
that is called if I'm not mistaken a platonic solid. there are only five of them in the third dimension: quadrahedron - 4 triangles, 4 vertices (my personal favorite) cube - 6 squares, 8 vertices octahedron - 8 triangles, 6 vertices dodecahedron - 12 pentagons, 20 vertices icosahedron - 20 triangles, 12 vertices if you would like to know what they look like Google it