square based pyramid
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
An icosahedron.
An octahedron.
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
An equilateral triangular pyramid
A REGULAR SQUARE PYRAMID.
yes, 2 pairs of congruent faces which are the 4 triangles in the triangular based pyramid:)
square based pyramid
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
A triangular prisim (3 faces on sides, one face on bottom).
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.
Icosahedron
An Icosahedron.
Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.
An icosahedron.
An octahedron.