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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