## Friday, September 23, 2011

### Geometry - What is an Octagon?

Octagons are closed figures with 8 sides and 8 angles.

~ Sesame Street: Jack Black defines Octagon

~ (Regular and Irregular)

~ How to Fold an Octagon

Younger students could do a cool craft activity with octagons. They could make a cute Octagon Person. Click here.

Older students could sketch and label a regular and irregular octagon in their math notebooks.

Students could also look for octagons in their environment. They could sketch or take pictures of octagons that they find. They could use the pictures to make a poster, book, or slide show. (They can also look in old magazines, catalogs, or online for pictures.)

Older students could measure the interior angles of a regular octagon with a protractor
and find the sum of all the interior angles.

(Each interior angle of a regular octagon equals 135 degrees and the sum of all 8 angles is 1080 degrees.)

Thanks for stopping by. Have fun with octagons.
Marcia :)

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