Transcript 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.
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Polygon:
Any straight-sided closed
plane figure.
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Polygons come in all
shapes and sizes.
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# of
sides
Name
Picture
3
Triangle
4
Quadrilateral
5
Pentagon
6
Hexagon
8
Octagon
10
Decagon
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Name The Quadrilateral
1)
2)
trapezoid
3)
rhombus
4)
rectangle
5)
parallelogram
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square
Name The Quadrilateral
The sum of all the angles equals
360º degrees in a quadrilateral.
90º
90º
90º
90º
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Today we are going to find the
Area of the Polygons
Rectangles & Squares.
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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.
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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.
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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
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What is the area of the rectangle?
5
x 6
2
30 ft.
5 ft.
2
6 ft.
30 ft or square feet
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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
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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
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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
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2
What is the area of the square?
4
x 4
2
16 m.
4 m.
4 m.
2
16 m or square meters
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What is the area of the square?
5
x 5
2
25 in.
5 in.
5 in.
2
25 in or square inches
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The End!
Take out your study guide!
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#1
The Area of a figure is the number of
square units needed to cover it.
2
3
Rectangle
4
A=2 3
6 square units
6 units2
Square
8m
8m
5
A  l w
A  5 4
20 un 2
A = s2
A  88
64 m 2
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#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
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height
width
length