0.00 $
 0 item(s)

Regular ninth-angle pyramid

Regular ninth-angle pyramid

At the base of the pyramid is the right ninth-corner (all sides are equal, the angles between the sides are 140 degrees).

The height of the pyramid is exactly in the center of the nine-cornered base.
Regular ninth-angle pyramid
net Regular ninth-angle pyramid

Geometric dimensions of the finished pyramid (mm):
Length = 107
Width = 110
Height = 85



How to quickly make a TORUS from a sheet of paper

Want to make a fairly complex geometric solid - torus in 10...

What Magic Edges issue to start from?

Suppose you first saw the edition “Magic Edges” on the counter of a bookstore or Internet...

Polyhedra made of ribbon

The article in “Science and Life” tells about an interesting way of making polyhedra....

Six boxes and the golden ratio

This polyhedron model is the intersection of three parallelepipeds.It is based on the intersection...

Dual pairs of polyhedra

What do the dodecahedron and icosahedron have in...

Polyhedron Chandelier

A suspended ceiling lamp, or simply a chandelier, has never been so close to exact mathematical...

Practical use of paper models

Quite often, a question about the practical use of paper models pops up. What is the point of...