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POLYGONS “MANY” “SIDES” A polygon is a 2-dimensional shape. This means that polygons have both length and width. L E N G T H WIDTH Polygons are closed shapes, and they are made of at least 3 line segments. Why is this shape NOT a polygon? This shape is NOT “closed.”

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polygons

POLYGONS

“MANY” “SIDES”

slide17
That’s a trick question. There is no such thing as a one-sided polygon. Remember, polygons must have at least 3 sides.
slide25
You can remember that a hexagon has six sides because the words hexagon and six both have the letter “x.”
you can remember the prefix hept by thinking of the heptathalon in the olympics
You can remember the prefix “hept” by thinking of the heptathalon in the Olympics.

heptathlon—a two-day event in which athletes compete in the 100-meter hurdles, high jump, shot put, and 200-meter dash on the first day and in the long jump, javelin, and 800-meter race on the second day.

slide29

Joyner-Kersee, JackieJoyner-Kersee, Jackie (1962- ), American track-and-field athlete, who won the heptathlon event (an all-around event) at the Olympic Games in 1988 and 1992. She is considered one of the greatest female athletes.

slide33
You can remember that a nonagon has nine sides because the words nonagon and nine both have two “ns.”
you can remember the prefix dec by thinking about a decade
You can remember the prefix “dec” by thinking about a decade.

2000

1999

1998

1997

1996

1995

TEN YEARS

1994

1993

1992

1991

this can easily be seen in the square
This can easily be seen in the square.

90 + 90 + 90 + 90 = 360

90

90

90

90

slide63

As the number of sides on the polygons increase by 1 side, the sum of the angles increases by 180.

+ 180

+ 180

slide66

hexagon

720