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Transcript 
Intro to Algebra/Geometry
Polygons
POLYGON
A polygon is a plane figure with three or more
angles and the same number of sides as
angles.
Polygon comes from a Greek word meaning
“many angled.”
Names of Polygons
Number of Sides
Name
3
Triangle
4
Quadrilateral
5
Pentagon
6
Hexagon
7
Heptagon
8
Octagon
9
Nonagon
10
Decagon
Triangle
Quadrilaterals
Different Quadrilaterals
• Rectangle – All interior angles are 90 degrees
and opposite sides are equal.
• Square – All interior angles are 90 degrees and
all sides are equal.
• Parallelogram – Opposite sides equal and
parallel
• Trapezoid – One pair of parallel sides
• Rhombus – Two pairs of parallel and equal
sides
Pentagon
Hexagon
Heptagon
Octagon
Nonagon
Decagon
REGULAR POLYGON
A regular polygon has all its sides and angles
equal.
Perimeter
The distance around an object
PERIMETER
The perimeter of a polygon is the sum of the
length of all its sides.
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