Helps the student to find area and perimeter of closed surface

2. 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?
You’re right! The area
of your house is greater
than the area of your
bedroom.

4. Area = 15 square feet
Lets find the area of this surface if each
square is equal to one foot.
Count the number of squares.
1 2
3
4 5 6 7 8
9 10 11 12 13 14
15

5. 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.
Try this one!
1
5
2
4
7
3
6
8 9

6. 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?
You’re right! The perimeter
of your house is greater
than the perimeter of your
bedroom.

8. Perimeter = 24 feet
Let’s find the perimeter of this surface if each
square is equal to one foot.
Count the number of sides.

9. Count the
number of
sides to
determine the
perimeter of
this flat
object.
The
perimeter is
equal to 12.
Try this one!

10. Two neighbors build swimming pools.
This is what the pools look like.
Family A
Family B
Which family has the pool with the
bigger swimming area?
Let’s do these problems together.

11. The area of Family A’s pool is?
Family A
Family B
8 square units.
7 square units
The area of Family B’s pool is?
Therefore, Family A has the pool with
the bigger swimming area.

12. The perimeter of Family A’s pool is 12 units long.
Family B
Family A
The perimeter of Family B’s pool is 14 units long.
Therefore, Family B has more side
panels of the pool to clean.
Now look at those same two pools. Which family
has more side panels of the pool to clean?