Area is the amount of square
units needed to cover the face
(or flat side) of a figure
When the area is found, it is
reported in square units.
If we imagine that this is the top of a solid
figure, What would the area be? Remember,
each square is equal to one square unit.
Count the number of squares.
1
2
Area = 15 square units
3
4
5
6
7
8
9
10
11
12
13
15
14
Try this one!
1
2
3
4
5
6
7
8
9
Count the
number of
green
squares to
determine
the area of
this surface.
What is the
area?
The area is
equal to 9
square units
or
A = 9 square
units
Perimeter is the distance
around the outside edge of a
polygon
When the perimeter is
found, it is reported in
units.
Let’s find the perimeter of this surface.
Count the number of units (or line segments)
that are along the sides of this figure.
Perimeter = 24 units
Try this one!
Count the
number of
units to
determine the
perimeter of
this figure.
The
perimeter is
equal to 12
units
or
P = 12 units.
Let’s 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?
Family A
Family B
A=?
A=?
The area of Family A’s pool is? 8 square units.
The area of Family B’s pool is?
7 square units
Therefore, Family A has the pool with
the bigger swimming area.
Family A
Family B
Now look at those same two pools. Which pool
has a larger perimeter?
The perimeter of Family A’s pool is 12 units long. P = 12 units
The perimeter of Family B’s pool is 14 units long. P = 14 units
Therefore, Family B’ pool
has a larger perimeter
Family A
Family B