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