Area and Perimeter. What is perimeter? The distance around a figure

Area and

Perimeter

What is perimeter?The distance around a figure.

Perimeter of Polygons

Add the lengths of ALL the sides together

10 cm.

10 cm.

5 cm.5 cm.

10 + 5 + 10 + 5 = 30 cm.

What is area?The amount or size of a surface or plane. Area

10 x 5 =

Area of Rectangles

Area = Length x Width

10 cm.

5 cm.

50 cm.2

l

w

9 x 4 =

Area of Parallelograms

Area = Base x Height

4 in.

9 in.

36 in.2

b

h

4 x 5=

½ 8 x 5

Area of Triangles

Area = ½ base x height

5 m.

8 m.

20 m.2

b

h

Volume of RectanglesVolume = Length x Width x Height

V= 12 x 3 x 2= 72cm.3

L= 12cm

H=3cm

W=2cm

Let’s Give it a

Try

6 x 8 =

Find the area

Area = Base x Height

8 in.

6 in.

48 in.2

b

h

10 x 8 =

Find the area of this rug

Area = Length x Width

10 ft.

8 ft.

80 ft.2

l

w

6 x 13=

½ 12 x 13

Find the area inside this pool ball rack

Area = ½ base x height

13 in.

12 in.

78 in.2

b

h

10 + 10 + 12 + 12=

Junior wants to build a rectangular dog pen for his dog Fido. If he wants to make a pen that is 10 feet in length and 12 feet in width,

how much fencing will he need to buy?

Perimeter = l + l + w + w

44 ft.

A= 200 x 100 =

Justin is planning on putting some fertilizer down on his lawn. His lawn is shaped like a parallelogram with a height of 100 feet and a base of 200 feet. Approximately, how many

square feet will Justin need to cover?

Area = Base x Height

20,000 ft.2

Find the Volume

• If a shoe box has a height of 4cm, a width of 5 cm and length of 9cm, what is the volume of the box?

V=LxWxH

Practice: Go to this site to practice area and Perimeter:

http://www.quia.com/rr/91670.html

Homework Time!

Area and Perimeter Practice Handout