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Here is a chart that might help answer your question. (three sides)

Polygon Names

Generally accepted names Sides Name n

N-gon 3

Triangle 4

Quadrilateral 5

Pentagon 6

Hexagon 7

Heptagon 8

Octagon 10

Decagon 12

Dodecagon

Names for other polygons have been proposed. Sides

Name 9

Nonagon, Enneagon 11

Undecagon, Hendecagon 13

Tridecagon, Triskaidecagon 14

Tetradecagon, Tetrakaidecagon 15

Pentadecagon, Pentakaidecagon 16

Hexadecagon, Hexakaidecagon 17

Heptadecagon, Heptakaidecagon 18

Octadecagon, Octakaidecagon 19

Enneadecagon, Enneakaidecagon 20

Icosagon 30

Triacontagon 40

Tetracontagon 50

Pentacontagon 60

Hexacontagon 70

Heptacontagon 80

Octacontagon 90

Enneacontagon 100

Hectogon, Hecatontagon 1,000

Chiliagon 10,000

Myriagon

Q: What is a 3-sided shape called?

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