3. AREA
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Menu
Use the menu to the left to navigate
around this PowerPoint to the various
sections.
Key
What is Geometry?
Area Activity
Exploration of Sides Sources
AREA Area of a Square
AREAArea of a Rectangle
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What is Geometry?
CClliicckk oonn tthhee sshhaappeess ttoo
hheeaarr tthheeiirr nnaammeess!!
Geometry is the study of 2-D and
3-D shapes.
Traits such as angles and the
number of sides (or surfaces) are
used to classify shapes.
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How many sides do I have?
Click on the image below and count the
sides of the square.
QuickTime™ and a
H.264 decompressor
are needed to see this picture.
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Count the sides…
Can you count the sides of the shapes?
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Count the sides…
Can you count the sides of the shapes?
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Area of a Square
How do we find area of a square?
To find the area (or
the amount of space
on the surface of the
shape), we use the
simple equation:
Length x Width = Area
(squared in.,
squared ft. etc.)
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Area of a Square
Example:
Square not drawn to scale
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Area of a Square
Now it’s your turn!
Find the area of the square below.
What is the area of this
square?
Square not drawn to scale
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Area of a Square
Let’s try one more…
Find the area of the square below.
What is the area of this square?
Square not drawn to scale
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Area of a Rectangle
How do we find area of a rectangle?
To find the area of a
rectangle (or the amount of
space on the surface of the
shape), we use the same
simple equation:
Length x Width =
Area (squared in.,
squared ft. etc.)
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Area of a Rectangle
Example:
Square not drawn to scale
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Area of a Rectangle
Now it’s your turn!
Find the area of the rectangle
below.
What is the area of this
rectangle?
Square not drawn to scale
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Area of a Rectangle
Let’s try one more…
Find the area of the rectangle
below.
What is the area of this
rectangle?
Rectangle not drawn to scale
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How many squares can I fit?
Now that you are an
expert on area of squares
and rectangles, can you
use that knowledge to
estimate how many small
squares you can fit into a
larger square?
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How Many Squares Fit?
To start, it helps to look at the length
and width of both squares.
Rectangle not drawn to scale
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How Many Squares Fit?
Now, how would you figure out how
many red squares would
fit into the blue
square?
How many red squares do you think will
fit into the blue square?
How do you know
this?
Rectangle not drawn to scale
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How Many Squares Fit?
Let’s count the number
of red squares that can
fit into the blue square.
Rectangle not drawn to scale
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Why is it important to know area?
Gardening
Construction
Installing carpet, tiles
Table Cloths/ Sheets
Can you think of any more reasons?
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In Class Activity
Now, look around the room for square or
rectangular objects.
– Use a ruler to measure the objects and use a calculator for
any big numbers.
– Make a chart and write down the name of the object, shape,
length, width, equation and area of the object.
(REMEMBER TO USE LABLES.)
Object Shape Length Width Equation Area
Desk Rect. 18 in. 24 in. 18 in x 24
in.= 432 sq.
in.
432 sq. in
Windo
w
Squar
e
10 in. 10 in. 10 in. x 10
in. = 100 sq.
in.
100 sq in.
