equilateral triangles
Triangle (tetrahedron, octahedron, icosahedron) Square (cube) Pentagon (dodecahedron)
You need at least 4 faces for a pyramid. That type is known as Tetrahedron (http:/en.wikipedia.org/wiki/Tetrahedron)
There are four number of faces in a tetrahedron.
Because a tetrahedron is a triangular based pyramid that has 4 identical faces and 4 faces meet at all the vertices.
equilateral triangles-Apex ;)
equilateral triangles-Apex ;)
There are points (vertices) lines (edges) and polygons (faces).
equilateral triangles
Triangle (tetrahedron, octahedron, icosahedron) Square (cube) Pentagon (dodecahedron)
You need at least 4 faces for a pyramid. That type is known as Tetrahedron (http:/en.wikipedia.org/wiki/Tetrahedron)
pentagons
A tetrahedron has 4 faces.
A tetrahedron has four faces.
The polygons are the equilateral triangle, the square, and the regular pentagon. The faces of these platonic solids are made from the following polygons: tetrahedron - 4 triangles cube - 6 squares octahedron - 8 triangles dodecahedron - 12 pentagons icosahedron - 20 triangles
Equilateral triangles
Polygons aren't normally described as having faces Polyhedrons are normally described as having faces So it could be a tetrahedron which is a triangular based pyramid