## Welcome to Miss K's Blog!!!

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## Wednesday, January 11, 2012

### Polygons and Triangles

We reviewed a ton of terms today, but it seemed like you all really knew what you were doing!  Here's a review:

Other polygon names:  From Wikipedia.
 triangle (or trigon) 3 The simplest polygon which can exist in the Euclidean plane. quadrilateral (or quadrangle or tetragon) 4 The simplest polygon which can cross itself. pentagon 5 The simplest polygon which can exist as a regular star. A star pentagon is known as a pentagram or pentacle. hexagon 6 avoid "sexagon" = Latin [sex-] + Greek heptagon 7 avoid "septagon" = Latin [sept-] + Greek octagon 8 enneagon or nonagon 9 "nonagon" is commonly used but mixes Latin [novem = 9] with Greek. Some modern authors prefer "enneagon". decagon 10 hendecagon 11 avoid "undecagon" = Latin [un-] + Greek dodecagon 12 avoid "duodecagon" = Latin [duo-] + Greek tridecagon (or triskaidecagon) 13 tetradecagon (or tetrakaidecagon) 14 pentadecagon (or quindecagon or pentakaidecagon) 15 hexadecagon (or hexakaidecagon) 16 heptadecagon (or heptakaidecagon) 17 octadecagon (or octakaidecagon) 18 enneadecagon (or enneakaidecagon or nonadecagon) 19 icosagon 20 triacontagon 30 hectogon 100 "hectogon" is the Greek name (see hectometre), "centagon" is a Latin-Greek hybrid; neither is widely attested. chiliagon 1000 The measure of each angle in a regular chiliagon is 179.64°. myriagon 10,000 The internal angle of a regular myriagon is 179.964°. megagon[6] 1,000,000 The internal angle of a regular megagon is 179.99964 degrees. apeirogon $\infty$ A degenerate polygon of infinitely many sides

Tonight's homework is the Triangles and Polygons worksheet.  Good luck!

-Miss K  :)