Polygons And Perimeter

Polygons & Perimeter PERIMETER = distance around = add up the distance along each side POLYGON = “many-angles” = closed 2-dimensional shape with line segment edges From wikipedia ( http://en.wikipedia.org/wiki/Polygon ): Polygon names Name Edges henagon (or monogon) 1 digon 2 triangle (or trigon) 3 quadrilateral (or tetragon) 4 pentagon 5 hexagon 6 heptagon (avoid "septagon" = Latin 7 [sept-] + Greek) octagon 8 enneagon (or nonagon) 9 decagon 10 hendecagon (avoid "undecagon" = 11 Latin [un-] + Greek) dodecagon (avoid "duodecagon" = 12 Latin [duo-] + Greek) tridecagon (or triskaidecagon) 13

tetradecagon (or tetrakaidecagon) pentadecagon (or quindecagon or pentakaidecagon) hexadecagon (or hexakaidecagon) heptadecagon (or heptakaidecagon) octadecagon (or octakaidecagon) enneadecagon (or enneakaidecagon or nonadecagon) icosagon No established English name "hectogon" is the Greek name (see hectometre), "centagon" is a Latin-Greek hybrid; neither is widely attested. chiliagon myriagon googolgon

14 15 16 17 18 19 20

100

1000 10,000 10100

For large numbers, mathematicians usually write the numeral itself, e.g. 17-gon.

Classwork Example:

Instructions: Inside each figure write the number of sides. Write its name underneath the polygon. Measure its perimeter in inches, in centimeters, then divide the two (cm ÷ in), and write these three numbers to the figure’s side.

Perimeter 4 1/16 = 4.0625 in 11 cm 11 ÷ 4.0625 = 2.71 pentagon

GEOMETRY Polygons & Perimeters

Mr. Yates

Name __________________ Date _______ Pd _________