Area and

1
Area and Perimeter
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Area
Area is the amount of surface space that a flat
object has.
Area is reported in the amount of square units.
3
When you measure the amount of carpet to cover
the floor of a room, you measure it in square
units.
?
Would the area of your bedroom or the area of
your house be greater?
?
Youre right! The area of your house is greater
than the area of your bedroom.
4
Lets find the area of this surface if each square
is equal to one foot. Count the number of
squares.
1
2
Area 15 square feet
3
4
5
6
7
8
9
10
11
12
13
14
15
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Count the number of green squares to determine
the area of this surface. What is the area?
Try this one!
1
2
3
5
4
6
7
8
9
The area is equal to 9 square units.
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Perimeter
Perimeter is the distance around the outside edge
of a flat object.
Perimeter is reported as a total number of linear
units.
7
When you measure the amount of wallpaper border
to go around a room, you measure it in lengths.
?
Would the perimeter of your bedroom or the
perimeter of your house be greater?
?
Youre right! The perimeter of your house is
greater than the perimeter of your bedroom.
8
Lets find the perimeter of this surface if each
square is equal to one foot. Count the number of
sides.
Perimeter 24 feet
9
Try this one!
Count the number of sides to determine the
perimeter of this flat object.
The perimeter is equal to 12.
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Lets do these problems together.
Two neighbors build swimming pools. This is what
the pools look like.
Which family has the pool with the bigger
swimming area?
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The area of Family As pool is?
8 square units.
7 square units
The area of Family Bs pool is?
Therefore, Family A has the pool with the bigger
swimming area.
12
Now look at those same two pools. Which family
has more side panels of the pool to clean?
The perimeter of Family As pool is 12 units long.
The perimeter of Family Bs pool is 14 units long.
Therefore, Family B has more side panels of the
pool to clean.
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The End