polygons
TRANSCRIPT
What is a Polygon????
A polygon is a closed plane figure with 3 or more sides (all straight lines, no curves).
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
“TRI” means three
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
“QUAD” means four
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
From the Greek word
“PENTE” means five
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
HEX and SIX both have letter X
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
HEPTA derives from the Latin prefix “SEPTUA” means seven
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
From the Greek word “OCTA”
means eight
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
NON has same sound with nine
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
From the word DECADE means
ten
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
Hendecagon derives from
UNDECAGON. Latin prefix “una” means one and “deca” means
ten.
number of Sides Name
3
4
5
6
7
8
9
10
11
12
Classifying Polygons by number of Sides
Triangle
Nonagon
Pentagon
Hexagon
Heptagon
Octagon
Quadrilateral
Decagon
Hendecagon
Dodecagon
Latin prefix “dos” means two
and “deca” means ten.
CONVEX POLYGON CONCAVE POLYGON
TWO TYPES OF POLYGONS
Convex polygon
- if any line drawn through it intersects only two other
lines
- all vertices point outward
TWO TYPES OF POLYGONS
Concave polygon
- if any line drawn through the polygon can hit more than
two other lines
- at least one vertex points inward towards the center of
the polygon (The side looks like it “caved” in)
Name the polygon according to its side
Write polygon or not polygon
Identify whether the following figure is convex polygon,
concave polygon or NOT polygon
1. 3.2.
Write the correct answer.
1. It is a closed figure made by 3 or more
straight lines, no curves.
2. I am a polygon with 3 sides, what am I?
3. What do we call if the polygon has more
than 12 sides?
4 – 5. What are the two types of polygon?
6. A type of polygon which all vertices point
outward
7. A type of polygon at least one vertex points
inward towards the center of the polygon
8. Draw an example of convex polygon
9. Draw an example of concave polygon
10. How many sides does hexagon have?
Using the different polygons, draw something we usually see to our
everyday life