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Transcript 
2D Shapes.
Polygons.
What is a polygon?
A polygon is a closed plane
shape made out of straight lines.
The lines that make up the
polygon are called sides.
The points at which the lines
meet are called corners.
What is a polygon?
A polygon has the same number
of sides as it has corners.
Polygons can be broken into
two categories:
regular
irregular
What is a regular
polygon?
A regular polygon is a polygon
with all sides and corners equal.
What is an irregular
polygon?
An irregular polygon is a polygon
with different sides and angles.
Now let’s discuss
different polygons…
The triangle…
The triangle has three sides and
three angles.
It can be regular and irregular. It
all depends upon the angles and
sides.
The rectangle…
The rectangle is an irregular
polygon because the sides are not
equal.
The square…
The square is a regular polygon
because all its sides and angles
are equal.
The pentagon…
The pentagon has five sides and
five angles. It can be a regular or
an irregular polygon.
The hexagon…
The hexagon is a six sided
polygon. It has six angles. It can
be regular and irregular.
The heptagon…
The heptagon is a polygon with
seven sides and seven angles. It
can be regular and irregular. It all
depends on the sides and angles.
The octagon…
The octagon is an eight sided
shape with eight angles. It can be
regular and irregular.
Polygons around
us…
Polygons surround us
everywhere we go.
If we go shopping we may see a
rectangular polygon saying that
the shop is closed.
Closed
Polygons around
us…
If we walk in the street we see
many different polygons to be
used by drivers or by passers by.
Polygons around
us…
Signs around us have different
shapes.
Different shapes have different
purposes.
A rectangular or
square polygon…
A square or a rectangular sign
gives information.
Closed
A triangular
polygon…
A triangular sign displays a
warning. Be careful!...
Other Polygons…
Octagonal signs give orders.
Orders should be obeyed to
avoid inconveniences to
everybody.
Without signs…
Without signs our life would be
without direction.
The End.
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