A line segment gets its name from letters assigned to
the end points. Look at the line segment below. The line
segment is called RS.
A closed figure that is formed by 3 or more line
segments is called a polygon. Look at the polygon below.
The point where two line segments meet is called the
vertex. (The plural of vertex is vertexes or vertices.)
Like all points, the vertices are named by a letter. In the
figure above the vertices are A,
B, C, and D. You can name a polygon by starting at a letter and moving around the
figure. The polygon above could be called ABCD or BCDA. You may start at any
letter and move around the polygon to give it a name. You may also go in any
direction.
The polygon above may be called the following names.
ABCD
BCDA
CDAB
DABC
ADCD
DCBA
CBAD
BADC
A circle is not a polygon.
Look at the figures below. Write "Yes" if the figure is a polygon and
write "No" if the figure is not a polygon.
Polygon?
Polygon?
Polygon?
Polygon?
Polygon?
Polygon?
Look at the figures below. Complete the name of each polygon.
Polygon ST
Polygon TW
Polygon SY
Polygon KB
Polygon GH
Polygon PF
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