a closed figure made by joining line segments Each line segment intersects exactly two others. line segments do not intersect What is a polygon? *All images are either original artwork or are used with permission from Microsoft Word and Microsoft Online Design Gallery.
Are these figures polygons? yes no yes no
A regular polygon is a polygon whose sides are all the same length and whose angles are all the same. What is a regular polygon?
The sides are not all the same length. The angles are not all the same. These are not examples of regular polygons.
triangle What is a three-sided polygon? Let’s look at some different kinds of polygons.
parallelogram What is a four-sided figure whose opposite sides are parallel? Polygons
rectangle What is a four-sided polygon whose sides and angles are all the same? Polygons
square What is a parallelogram or rectangle with four equal sides and angles? Polygons
rhombus What is a parallelogram whose sides are all the same length? Polygons
trapezoid What is a four-sided polygon having exactly one pair of parallel lines? Polygons
pentagon What is a five-sided polygon? Polygons
hexagon What is a six-sided pentagon? Polygons
heptagon What is a seven-sided pentagon? Polygons
octagon What is an eight-sided pentagon? Polygons
regular polygon triangle parallelogram rectangle square rhombus trapezoid pentagon hexagon heptagon octagon Let’s review the polygons we‘ve learned about today.
Using your geoboards or dot paper, replicate these polygons.