### in 2 - Granicher

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•Remove all other thoughts from your mind.
•Pay close attention.
•Try all the examples.
•Ignore all other distractions.
Polygon:
Any straight-sided closed
plane figure.
Polygons come in all
shapes and sizes.
# of
sides
Name
Picture
3
Triangle
4
5
Pentagon
6
Hexagon
8
Octagon
10
Decagon
1)
2)
trapezoid
3)
rhombus
4)
rectangle
5)
parallelogram
square
The sum of all the angles equals
90º
90º
90º
90º
Today we are going to find the
Area of the Polygons
Rectangles & Squares.
Area is the number of square units that
are needed to cover the surface of a figure.
height
(h)
base (b)
How many squares cover this rectangle?
The area of this rectangle is
12 squares or 12 units squared.
Label the dimensions of this rectangle.
2
units
6 units
2
2 units x 6 units = 12 units .
2
Area is in units because you are
multiplying units.
We found the area of the rectangle by
multiplying the base times the height.
2
units
A = bh
6 units
The area of a rectangle is also
known as the length times the width.
A = bh
is the same as A = lw
What is the area of the rectangle?
5
x 6
2
30 ft.
5 ft.
2
6 ft.
30 ft or square feet
PERIMETER: Is the distance around a
figure.
in + in + in + in =
in
AREA: Is the square units that cover a
figure.
length • width = in • in =
in
2
squared
width
length
VOLUME: The number of cubic units
inside a figure.
length • width • height
3
cubed
in • in • in = in
height
width
length
What is the area of the rectangle?
2 in.
5 in.
2
2
x 5
2
10 in.
10 in or square inches
A square is a special rectangle.
Since the base and the height are the
same size, we call them sides (s) instead
of base and height.
height = s
A= s
s
s
base = s
2
What is the area of the square?
4
x 4
2
16 m.
4 m.
4 m.
2
16 m or square meters
What is the area of the square?
5
x 5
2
25 in.
5 in.
5 in.
2
25 in or square inches
The End!
#1
The Area of a figure is the number of
square units needed to cover it.
2
3
Rectangle
A=2 3
6 square units
6 units2
Square
8m
4
8m
5
A  l w
A = s
A  54
20 un
2
A  88
2
64 m
2
#2
PERIMETER: Is the distance around
a figure.
in + in + in + in =
in
AREA: Is the square units that cover
a figure.
length • width = in • in =
squared
width
2
in
length
VOLUME: The number of cubic units
inside a figure.
length • width • height
3
cubed
in • in • in = in