Some brands of razor blades stamp the blades so that if there is a quality control concern during the manufacturing process there is a way to identify the sides of the blade. Usually the blade has "1 2" on one side and "3 4" on the other. People frequently ask if the numbers are to designate a side that is better for shaving, but both sides are the same in that regard. Some men use the numbers for keeping track of the edge that they most recently used during their shave. The argument is that flipping the blade in the razor between shaves allows the edge to be worn down more evenly. However, most people just ignore the numbers and enjoy their shaves as usual.
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13 sides: Triskaidecagon14 sides: Tetrakaidecagon15 sides: Pentakaidecagon16 sides: Hexakaidecagon17 sides: Heptakaidecagon18 sides: Octakaidecagon19 sides: Enneakaidecagon20 sides: Icosagon
They are called sides.
Hendecagon has 11 sides,dodecagon has 12 sides,triskaidecagon has 13 sides,tetradecagon has 14 sides,pentadecagon has 15 sides,hexadecagon has 16 sides,17 sides is heptadecagon,octadecagon have 18 sides,enneadecagon has 19 sides,20 sides is called as icosagon. The prefix of that 9 polygons is Greek. A polygone with 4 sides is called a quadrilateral.
Six sides
pentagon (5 sides) hexagon (6 sides) heptagon ( 7 sides) octagon (8 sides) nonagon (9 sides) decagon (10 sides)