A polyhedron (plural polyhedra or polyhedrons) is often defined as a geometric object with flat faces and straight edges (the word polyhedron comes from the Classical Greek ÏÎ¿Î»ÏÎµÎ´ÏÎ¿Î½, from poly- , stem of ÏÎ¿Î»ÏÏ, many, + -edron, form of ÎµÎ´ÏÎ¿Î½, base, seat, or face). polyhedron is any three-dimensional figure with flat surfaces that are polygons. Specifically, any geometric shape existing in three-dimensions and having flat faces, each existing in two-dimensions, which intersect at straight, linear edges.
In 1839, Charles Goodyear invented rubber vulcanization, but the first rubber condom was not produced until 1855. Just a few short years later, the majority of rubber companies were producing condoms as well. These condoms were reusable, which meant they were much more affordable.
The  first patent for a flushing water closet was issued to Alexander  Cummings in 1775, sixty years before Thomas Crapper was born.Thomas crapper was just a myth he didn't invent the tioletFrank Henrieta invented the toilet seat during the Italian Renaissance in 1634.he earliest patent I can find for a toilet bowl brush, # 160415, was granted to Moser in October of 1950.   Thomas Crapper did NOT invent the toilet bowl brush, although â¦ he did patent several other things, including the ballcock, which is part of a flush toilet.