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Perimeter of Polygons Add the lengths of ALL the sides together 10 cm. 5 cm = 30 cm.
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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