This tessellation is made of blue regular hexagons, as well as rhombi containing 40 and 140 degree angles (red), and rhombi containing 80 and 100 degree angles (yellow).

# Tag Archives: rhombus

## 36 Rhombi in an Octadecagon

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## A Blue Tessellation of Rhombi and Regular Hexagons

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# Tessellation Featuring Circles and Rhombi

Is there anything more relaxing than constructing a tessellation?

# The Rhombic Octagonoid, a Zonohedron With Ninety Faces

To make this zonohedron with *Stella 4d* (available as a free trial download here), start with a dodecahedron, and then perform a zonohedrification based on both faces and vertices. It is similar to the rhombic enneacontahedron, with thirty equilateral octagons replacing the thirty narrow rhombic faces of that polyhedron.

I’ve run into this polyhedron from time to time, and I’ve also had students make it. It is the largest zonohedron which can be built using only red and yellow Zome (available here). I thought it needed a name, so I made one up.

## A Radial Tessellation of Regular Pentagons and Rhombi

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# The Golden Rhombus, the Rhombic Triacontahedron, and the Rhombic Hexecontahedron

There’s a special rhombus which is called the “golden rhombus,” because its diagonals are in the golden ratio. To construct it with compass and straight edge, you first construct a golden rectangle (shown with blue edges and a yellow interior), and then connect the midpoints of its sides to form a rhombus (with edges shown in red).

Several polyhedra can be made which use golden rhombi as their faces. The most well-known of these polyhedra is the rhombic triacontahedron, which has 30 such faces. It is the dual of the icosidodecahedron.

If the rhombic triacontahedron is stellated 26 times, the result is the (non-convex) rhombic hexecontahedron. It has 60 golden rhombi as faces.

Both of these polyhedra can be constructed with Zometools (available at http://www.zometool.com). With white Zomeballs and red Zomestruts, these polyhedra look a lot like this:

The flat image at the top of this post was created using *Geometer’s Sketchpad* and *MS-Paint*. The four rotating polyhedral images were created using *Stella 4d: Polyhedron Navigator*, which you can purchase, or try for free, at http://www.software3d.com/Stella.php.

## Tessellation of Rhombi and Star Hexagons

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# A Radial Tessellation Using Three Types of Rhombi

The yellow rhombi have angles of 40 and 140 degrees, while the blue rhombi have angles of 80 and 100 degrees, just like in the last post here. However, that post did not include the red rhombi, which have angles of 60 and 120 degrees.

# A Radial Tessellation Using Two Types of Rhombi

The yellow rhombi have angles which measure 40 and 140 degrees, while the blue rhombi’s angles measure 80 and 100 degrees.