Decagonal

“Straight edges and compasses work fine for the recurring symmetries of the simplest patterns we see, but it probably required far more powerful tools to fully explain the elaborate tiling with decagonal 10-sided symmetry,” Mr Lu said. ❋ Unknown (2007)

While traveling in Uzbekistan, Lu said, he noticed a 16th century Islamic building with decagonal motif tiling, arousing his curiosity as to the existence of quasicrystalline Islamic tilings. ❋ Unknown (2007)

The mausoleum of Theodoric, a decagonal structure, covered with a great monolith thirty-six feet in diameter, is the monument that reveals Roman art in its purest form, at once austere and graceful. ❋ 1840-1916 (1913)

The earliest example is probably that of Lincoln, decagonal in shape, which was built from 1240-1260. ❋ 1840-1916 (1913)

It was decagonal in plan, with a projecting buttress at each angle. ❋ Unknown (1906)

The upper story is also decagonal, and is reached by a flight of modern stone steps. ❋ Charles Dudley Warner (1864)

Jules Rimet Trophy, was an 18-karat solid gold statuette of the winged goddess Nike holding aloft a decagonal cup. ❋ Will Oremus (2011)

In 1998, the trophy was remodeled and the new design included cool things like a decagonal rotating middle piece, with carved maps of the continents and precious stones (black onyx, yellow citrine, greenchyrsopase, red garnet and blue topaz) inlaid to symbolizes the five continents and represent all the regions in the world. ❋ Unknown (2010)

Medieval Islamic Architecture Presages 20th-century Mathematics Intricate decorative tilework found in medieval architecture across the Islamic world appears to exhibit advanced decagonal quasicrystal geometry -- a concept discovered by Western mathematicians and physicists only in the 1970s and 1980s. ❋ Unknown (2008)

∗ n 2n − 0 n 3n − 1 n 4n − 2 n 2 2 = n2 2 2 Based on the pattern developing across the nth row, have your students determine what the general forms of the heptagonal, octagonal, decagonal, etc., numbers are. ❋ Sahmozac (2010)

Person 1: Do you know what a [decagon] is? Person 2: Person 1: It's a 10 [sided] [polygon]! Person 2: nerd ❋ H_best_letter (2022)