Lesson
Page
Modeling/
Multiple Representation |
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Perimeter
is the word used to describe
the distance around the outside of an object or shape.
You can use
counting units to
find the perimeter of a shape, by counting the number of sides that
touch the outside of the shape. |
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Example |
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Find the
perimeter of this square using
counting units.
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Count the number of
sides that touch the outside of the square. There are
3 counting units
on each side of the square and there are 4
sides to the square (3 + 3 + 3 + 3 = 12).
The
perimeter
is 12
units. |
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Area
is the number of square
units needed to cover a flat surface.
You can use counting units
to find the area of a shape, by counting the number of squares
inside of it.
1 square unit |
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Example |
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Find the
area of this shape using
counting units. |
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Count the number of
squares in the whole shape.
The
area
is
13 square
units because there are 13 squares in the shape. |
Sometimes you need to
count half squares
to find the area
of a figure.
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Example |
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Find the
area of this shape using
counting units. |
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Count the number of
whole squares in the shape first. Then
count the half square.
The
area
is
8
1/2
square units
. |
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Volume
is the number of
cubic units needed to fill a space figure.
You can use counting units
to find the volume of a shape, by counting the number of cubes.
1 cubic unit
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Example |
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Find the
volume of this shape using
counting units. |
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Count the number of
cubes in the shape.
The
volume
is
5 cubic units. |
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Remember:
You can use
counting units to
measure the
perimeter, area, or
volume of a shape or object. |
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