New
New
Securing understanding of perimeter and area
I can find the perimeter and area of basic shapes.
Lesson 2 of 12
New
New
- Year 7
Securing understanding of perimeter and area
I can find the perimeter and area of basic shapes.
Lesson details
Key learning points
- You can calculate the area and perimeter of rectangles.
- Different rectangles can have the same perimeter.
- The area of a parallelogram can be deduced from the area of a rectangle.
- The base and perpendicular height of parallelograms can be identified.
- The area of any parallelogram can be calculated.
Keywords
Parallelogram - A parallelogram is a quadrilateral with two pairs of parallel and equal sides.
Area - The area is the size of the surface and states the number of unit squares needed to completely cover that surface.
Perimeter - The perimeter is the distance around a 2D shape.
Common misconception
Pupils may confuse perimeter and area.
Perimeter is the distance around a 2D shape. Area is the size of the surface.
To remember perimeter, it may help pupils to think the of rim of a glass and that this is traced around the glass.
Teacher tip
Equipment
Licence
This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.True or false? These lines are an example of parallel lines.
True or false? These lines are an example of parallel lines.
True
Correct answer: False
False
Q2.An alternative name for a regular triangle is an triangle
An alternative name for a regular triangle is an triangle
Correct Answer: equilateral
equilateral
Q3.Starting with triangle, put these shapes in order from smallest to greatest number of sides.
Starting with triangle, put these shapes in order from smallest to greatest number of sides.
1 - triangle
1
- triangle
2 - trapezium
2
- trapezium
3 - pentagon
3
- pentagon
4 - hexagon
4
- hexagon
5 - octagon
5
- octagon
Q4.How many unit squares are inside the rectangle?
How many unit squares are inside the rectangle?
Correct Answer: 28, 28 squares, twenty eight, twenty-eight, twenty eight squares
28, 28 squares, twenty eight, twenty-eight, twenty eight squares
Q5.What is the length of the line marked $$k$$?
What is the length of the line marked $$k$$?
Correct Answer: 8 cm, 8 centimeters, 8 centimetres, eight cm, eight centimeters
8 cm, 8 centimeters, 8 centimetres, eight cm, eight centimeters
Q6.If two lines are perpendicular then they ______
If two lines are perpendicular then they ______
never meet
meet at one point
Correct answer: meet at right angles at one point
meet at right angles at one point
meet at multiple points
Assessment exit quiz
6 Questions
Q1.Match the word to its definition
Match the word to its definition
Correct Answer:perimeter,the distance around a 2D shape
perimeter -Â the distance around a 2D shape
Correct Answer:area,the size of the surface
area -Â the size of the surface
Correct Answer:parallelogram,the quadrilateral with two pairs of parallel and equal sides
parallelogram -Â the quadrilateral with two pairs of parallel and equal sides
Q2.What is the minimum information needed to calculate both the area and perimeter of a rectangle?
What is the minimum information needed to calculate both the area and perimeter of a rectangle?
All four lengths
Two parallel lengths
Correct answer: Two perpendicular lengths
Two perpendicular lengths
One length and the diagonal
Q3.True or false? Given a value for the perimeter, there is only one possible rectangle you could draw.
True or false? Given a value for the perimeter, there is only one possible rectangle you could draw.
True
Correct answer: False
False
Q4.A rectangle has an area of 72 units$$^2$$ and a perimeter of 36 units. How long are the length and width?
A rectangle has an area of 72 units$$^2$$ and a perimeter of 36 units. How long are the length and width?
Length = 9 units and width = 8 units
Length = 10 units and width = 8 units
Length = 11 units and width = 7 units
Correct answer: Length = 12 units and width = 6 units
Length = 12 units and width = 6 units
Q5.A parallelogram with four interior angles, each equal to 90 degrees, is called a
A parallelogram with four interior angles, each equal to 90 degrees, is called a
Correct Answer: rectangle, square
rectangle, square
Q6.Calculate the area and perimeter of this parallelogram.
Calculate the area and perimeter of this parallelogram.
Area = 48 m$$^2$$ and perimeter = 24 m
Correct answer: Area = 48 m$$^2$$ and perimeter = 36 m
Area = 48 m$$^2$$ and perimeter = 36 m
Area = 80 m$$^2$$ and perimeter = 24 m
Area = 80 m$$^2$$ and perimeter = 36 m
