'(<a href="http://www.j-archive.com/media/2010-07-20_DJ_15.wmv">Sarah of the Clue Crew shows a geometric animation on the monitor.</a>)  Two identical regular pyramids with square bases attached base to base form the regular type of this geometrical figure in which all faces are equilateral triangles'
an octahedron
GEOMETRY: Two identical regular pyramids with square bases attached base to base form the regular type of this geometrical figure in which all faces are equilateral triangles
Two identical regular pyramids with square bases attached base to base form the regular type of this geometrical figure in which all faces are equilateral triangles
Two identical regular pyramids with square bases attached base to base form the regular type of this geometrical figure in which all faces are equilateral triangles
GEOMETRY
an octahedron
GEOMETRY