Transcript Polygons

A Polygon is a closed
plane figure formed by
line segments.
open
Not a polygon
closed
Polygon
Polygons are named by the
number of sides or angles
they have. The number of
sides is equal to the
number of angles.
Name
Triangle
#Sides #Angles
3
3
Quadrilateral 4
4
Pentagon
5
5
Examples
Name
#Sides #Angles
Hexagon
6
6
Heptagon
7
7
Octagon
8
8
Examples
Polygons are either regular
or irregular. These are
regular polygons:
These are irregular
polygons:
A regular polygon has all
sides the same length and
all the angles the same
measure.
An irregular polygon has
sides of various lengths
and angles of different
measures.
Polygons that have the
same shape and size are
congruent.
Exact fit
Polygons that have the same
shape are similar. They may
or may not have the same size.
Similar polygons
Non-Similar polygons