In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or right anglesШУУД ҮЗЭХ and
In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or right angles).[1] It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices ABCD would be denoted \square ABCD. The square is the n=2 case of the families of n-hypercubes and n-orthoplexes. A square has Schläfli symbol {4}. A truncated square, t{4}, is an octagon, {8}. An alternated square, h{4}, is a digon, The name Red Square does not originate from the pigment of the surrounding bricks (which, in fact, were whitewashed at certain times in history) nor from the link between the color red and communism. Rather, the name came about because the Russian word красная (krasnaya), which now means "red," originally meant "beautiful"; in this meaning, it was applied to a small area between St. Basil's Cathedral, the Spassky Tower of the Kremlin, and the Lobnoe Mesto (place of execution), and Tsar Alexei Mikhailovich officially extended the name to the entire square, which had previously been called Pozhar, or "burnt-out place." Several ancient Russian towns, such as Suzdal, Yelets, and Pereslavl-Zalessky, have their main square named Krasnaya ploshchad.
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