Finally, let’s discus how polygons are named by the number of sides they
have. By now you are familiar with three-sided polygons or triangles. A
regular triangle is an equilateral triangle. A four-sided polygon is called a
quadrilateral. A regular quadrilateral is a square. Polygons with five sides
or more take special prefixes. Study these names below:
Five-sided PENTAgon
Six-sided HEXAgon
Seven-sided HEPTAgon
Eight-sided OCTAgon
Nine-sided NONAgon
Ten-sided DECAgon
Twelve-sided DODECAgon
SET 44
State whether the object is or is not a polygon and why. (Envision
each of these objects as simply as possible, otherwise there will always
be exceptions.) If the object is a polygon, name the polygon as specif-
ically as possible.
- a picture frame for a 57 photo
- Manhattan’s grid of city blocks
- branches of a tree
- the block letter “M” carved into the tree
- half of a peanut butter and jelly sandwich that was cut diagonally
into equal parts - a balloon
- a stop sign
- lace
501 Geometry Questions