A polyhedron is a 3D shape with faces made from polygons. Cubes, cuboids, tetrahedron and prisms are examples of polyhedra. When you open out a polyhedron as a net, it shows all the polygons that ...

[Peter Hall] has gotten around this by building an omnicopter drone with six motors mounted in different orientations on a collapsed tetrahedron frame. The shape of the frame consists of six ...