Triangular Bipyramid

Origami, Polyhedra Add comments

Mar 052021

In Mathematics, a Triangular Bipyramid is a six-sided diamond, made from six isosceles triangle faces. As the name suggests, the Triangular Bipyramid is constructed by joining two Triangular Pyramids (Tetrahedra) along one face.

The Origami Triangular Bipyramid is designed by John Montroll, in the book ‘A Plethora of Polyhedra in Origami‘. The last polyhedron that I had made from this book was way back in 2010. I had done the Decahedron then.

The Triangular Bipyramid is a relatively easy model to fold. The only issue is folding involved in finding the angles, which involves some re-creasing to get the right fold. Since I didn’t want too many extra folds to show up, I folded initially on one paper, figured out the correct folds for the angles, then copied the same folds on a new paper.

The model is folded flat till the last step, when it becomes a 3D model, by pulling a little on the sides.

Given the beautiful shape, I think this will make a great Christmas decoration, when folded in colourful paper