Air casan a thèid do chuideachadh a bhith a 'lorg an leabhar air a' octahedron.
An octahedron tha geometric solid a limited 8 equilateral triangles, an taobh a-octahedron tha 8 triantanach, aodann, 12 oirean, 6 vertices, gach vertex converge 4 ribs.