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AreaArea is the amount of surface inside a closed boundary.
Area tells the number
of square units.
This rectangle’s area is
6 square units.
Think: AREA, SQUAREA !
Area of a Rectangle
3 in
ch
es
5 inches
Multiply the length times the width.
L x W = AREA
3” x 5” = 15 square inches
The area of this square is 9 square units.
And….the area of this rectangle is 12 square units.
You can find the areaof your bedroom.
Multiply the length x width.
9 f
eet
12 feet
What is the area?
9’ x 12’ = 108 square feet
Area
What is the area of this backyard?
6
0 yd
s.
200 yds.
60 x 200 = 1,200 square yards
Area of a Triangle
3 in
ch
es
6 inches
A triangle is half the size of a rectangle so, multiply half of the length times the width.
1/2 x (base x height) = AREA1/2 of (3 x 6) = 9 square inches
What is the area of this triangle?
10 yards8 yard
s
1/2 of (8 x 10 ) = 40 square yards
PerimeterPerimeter is the distance around the outside edge of a shape.
Perimeter is measured in linear units.
This rectangle’s perimeter is 20 inches
5
inch
es
5 inches10 inches
10 inches
Think:
‘peri’ means around
Perimeter of a Rectangle
3 inches
5 inches
Add the length and width, then multiply by 2. 2 x (L + W) = PERIMETER 2 x (5 + 3) = 16 inches
3 inches
5 inches
5 inches
3 inches3 inches
5 inches
3 inches
What is the perimeter of this backyard?
20 yards
10
yard
s
20yards
10 yards
2 x (20 + 10) = 60 yards
What is the perimeter of this pool?
18 feet
18 feet
10 feet
10
feet
2 x (18 + 10) = 56 feet
Perimeter of a Triangle
Add the measure of each side.
5 " + 5 " + 4 " = 14 yards
5 ya
rds
5
yard
s4 yards
What is the perimeter of this triangle?
4 yards3 yard
s
5 yards
3 + 4 + 5 = 12 yards
4 5 6
321
Area Perimeter