Triangular ruler, for measurement and/or scale drawing, is made from foldable material that can be folded along fold lines and then glued together into star-section three-dimensional object

摘要

Triangular ruler, with a star-shaped section, is made from foldable material, e.g. paper, card, plastic, by folding along fold lines and then gluing two rectangular strips together. The ruler can be folded back into a flat shape for storage when not being used. Optionally, each face can have a different measurement scale and or units.