A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...

"I can recognize prisms and pyramids by sight, but I get their volume formulas mixed up." "I thought I memorized the formulas, but when I see a problem, I don't know which one to use." "I'm always ...

Charles Ross spent 50 years building “Star Axis,” a naked-eye observatory in New Mexico. Now his masterwork is ready. How to ...

When running classes, parents often ask me this: "My child says they want to be an architect, what should I have them do?" To be honest, you don't need to rush into making them do anything. The power ...

This is the ninth in a series of models illustrating the volume of solids designed by William Wallace Ross, a school superintendent and mathematics teacher in Fremont, Ohio. The unpainted wooden model ...

Before levels as we know them were invented, ancient civilizations still had to make sure their walls were level. This tool ...

Some standard modules for making 3d shapes with attachment support, and function forms that produce a VNF. Also included are shortcuts cylinders in each orientation and extended versions of the ...

This file provides functions and modules that construct shapes from a list of cross sections. In the case of skin() you specify each cross sectional shape yourself, and the number of points can vary.

Triangular faces of the high-coordination-number polyhedra in V 2 O 5 and marokite are too small to enable large cations through. This plays against Ca 2+ diffusing better than Mg 2+ ions in many ...