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Naming Polygons

Naming Polygons. HOMEWORK: Complete ‘Name That Polygon’ Activities WS. Naming a polygon by its number of sides requires that we know the appropriate Greek prefixes along with some rules for their use. For polygons with 3 through 20 sides, simply add " gon " to the prefixes to the right 

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Naming Polygons

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  1. Naming Polygons HOMEWORK: Complete ‘Name That Polygon’ Activities WS

  2. Naming a polygon by its number of sides requires that we know the appropriate Greek prefixes along with some rules for their use.

  3. For polygons with 3 through 20 sides, simply add "gon" to the prefixes to the right  - although a trigon is more commonly called a triangle and a tetragon, a quadrilateral!

  4. 21 - 99 SIDESTo "construct" a name, we start with the prefix for the tens digit, follow it by "kai" (the Greek word for "and"), then follow it with the prefix for the units digit, and finally add "gon." Example: A 35-sided polygon is called a "triacontakaipentagon."

  5. For more than 20 sides, we "construct" the name by combining prefixes: + 25 = icosi + kai + penta+ gon = icosikaipentagon 77 = heptaconta + kai + hepta + gon = heptacontakaiheptagon

  6. 100 - 999 SIDESFor numbers from 100 to 999, we need one more combining prefix and another rule. To "construct" the name, we start with the prefix for the hundreds digit taken from the "Ones Digit" table above, follow it by "hecta," then proceed as before. Example: A 672-sided polygon is called a "hexahectaheptacontakaidigon."

  7. Now you try some 914 sides 75 sides 753 sides

  8. How many sides?? Tetracontakaihexagon Icosikaioctagon Octacontakaihexagon Heptacontakaitrigon Octacontakaitrigon Dihectapentacontakaiheptagon Enneahectaenneacontakaienneagon

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