Polygon Presentation By: Elaine Hersh, Anna Oleszczuk, and Sarah Meder

Resource Page Polygon names Name Sides triangle (or trigon) quadrilateral (or tetragon) pentagon hexagon heptagon (avoid "septagon") 7 octagon enneagon decagon (or "nonagon") 8 9 10 3 4 5 6 tables found on wikepedia under polygons

Resource Page hendecagon (avoid "undecagon") 11 dodecagon (avoid "duodecagon") 12 triskaidecagon pentadecagon heptadecagon enneadecagon icosagon triacontagon pentacontagon 13 15 17 19 20 30 50 hectagon (avoid "centagon") 100 chiliagon 1000 myriagon 10,000

Resource Page

and

Tens Ones final prefix

1 hena 20 icosi 30 triaconta 2 -di 3 -tri 40 tetraconta 50 pentaconta 60 hexaconta 70 heptaconta 80 octaconta 90 enneaconta-

-kai-

4 -tetra 5 -penta 6 -hexa 7 -hepta 8 -octa 9 -ennea-

-gon

That is, a 42-sided figure would be named as follows:

Tens

tetraconta-

Tens

pentaconta-

and

-kai-

Ones final pre fix full polygon name

-di -gon and a 50-sided figure tetracontakaidigon

and

Ones final prefi x

-gon

full polygon name

pentacontagon

Types of Polygons

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Regular Polygons

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Triangles

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Quadrilaterals

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Pentagons

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Hexagons

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Octagons

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Decagons

Regular Polygons • All of the sides and the angles are congruent

Triangles • Three sided polygons

Quadrilaterals • Four sided polygons

Pentagons • Five sided polygons

Hexagons • Six sided polygons

Octagons • Eight sided polygons

Decagons • Ten sided polygons

2 Name the following polygons.

1 3

• 1 – HEXAGON • 2 – QUADRILATERAL • RECTANGLE • 3 - DECAGON

Name the following polygons.

1 2 3

• 1 – Octagon • 2 – Pentagon • 3 – Scalene Triangle

What polygons can you find… • In your classroom?

• On the playground?

• In your own home?