Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Do you really want to delete this prezi?
Neither you, nor the coeditors you shared it with will be able to recover it again.
Make your likes visible on Facebook?
You can change this under Settings & Account at any time.
perimeter and area
Transcript of perimeter and area
Work out the area of this shape
The perimeter is the length around
the edge of a shape.
How do you calculate the perimeter
of a shape?
Work out the perimeter of the sheet of paper you are using.
You can work with a partner
if you like!
Calculate the perimeter of this shape.
Units need to be the same
BEFORE working out perimeter.
75 cm = 0.75 m
The shape is a rectangle so
opposite sides are equal in length
Perimeter = 0.75 +1.75 + 0.75
= 5 m
How would you work out the perimeter of this shape?
You might want to copy the diagram!
Add up all the lengths!
Perimeter = 20 + 5 +15 + 3 +
5 + 2
= 50 cm
Work out the perimeter of a square that has sides measuring 6cm.
HINT: Draw a sketch first
The perimeter of a square is 32 metres. How long are the sides of the square?
Since the shape is a square, all the
sides will be 6 cm long.
Perimeter = 6 + 6 + 6 + 6
= 24 cm
The area is the amount of surface
(or space) covered by a flat shape.
Area is always measured in
square units eg,
square centimetres , cm
We can calculate the area of the above shape
by multiplying the length by the width
Area = 8 x 4 = 32 m
Work out the area of a rectangle with
sides 34 mm and 50 mm
Area = length x width
= 2 x 13
= 26 m
Area = 50 x 34 = 1700 mm
Give possible dimensions for a rectangle with
Need to make units the
75 cm = 0.75 m
Area = 0.75 x 1.3
= 0.975 m
Extra - 10mm x 8 mm, 20mm x 4 mm etc
Calculate the area of this shape
Split the shape into 2 rectangles:
Area of bigger rectangle = 6 x 15 = 90 cm
Area of smaller rectangle = 3 x 5 = 15 cm
Total area = 90 + 15 = 105 cm
Discuss with your partner
times when it would be
useful to know the area and
perimeter of a shape.
Can you come up an
example of each?
HINT: Be careful with the units
Perimeter = 32 cm
Each side must be 32/4 = 8 cm long
CHECK: 8 + 8 + 8 + 8 = 32 cm