Why this website

Icosahedron and Golden rectangle

Useful math knowledge

Sample calculations

Icosahedron calculator


3v dome

The 3v dome

3V dome calculator

Factors A & B

Factor C

Hexagon calculations

Pentagon calculations

Dihedral angles

Floor level


3V Greenhouse

Parts making

Mass production parts


In the newspaper

Photo gallery



2v dome links:

2V dome calculator

2v dome model

2V Factors A and B

2V factors calculation

2V Floor level area

2V AAB-Panel

2V BBB-Panel



Alternative growing

Friggebod small building

Icosahedron DIY


Dome forum

Daves domes canada His domes survives the winters in canada



Looking to buy a dome?

daves domes canada


Contact me:




Ensure your web browser allows java script




Put value in input box only


INPUT BOX Radius of icosahedron


Edge length triangles & golden rectangle short side
Equilateral triangle height
Golden rectangle long side
Dihedral angle
Circumference of sphere were icosa inscribed

Apothem, radius of sphere inscribed inside icosa



( multiply radius with to get edge length)