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Year 7

Securing understanding of perimeter and area

You can find the perimeter and area of basic shapes

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New
New
Year 7

Securing understanding of perimeter and area

You can find the perimeter and area of basic shapes

Download all resources
Share activities with pupils

Lesson details

Key learning points

  1. You can calculate the area and perimeter of rectangles.
  2. Different rectangles can have the same perimeter.
  3. The area of a parallelogram can be deduced from the area of a rectangle.
  4. The base and perpendicular height of parallelograms can be identified.
  5. The area of any parallelogram can be calculated.

Common misconception

Pupils may confuse perimeter and area.

Perimeter is the distance around a 2D shape. Area is the size of the surface.

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.

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

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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Starter quiz

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6 Questions

Q1.
True or false? These lines are an example of parallel lines.
An image in a quiz
True
Correct answer: False
Q2.
An alternative name for a regular triangle is an triangle
Correct Answer: equilateral
Q3.
Starting with triangle, put these shapes in order from smallest to greatest number of sides.
1 - triangle
2 - trapezium
3 - pentagon
4 - hexagon
5 - octagon
Q4.
How many unit squares are inside the rectangle?
An image in a quiz
Correct Answer: 28, 28 squares, twenty eight, twenty-eight, twenty eight squares
Q5.
What is the length of the line marked $$k$$?
An image in a quiz
Correct Answer: 8 cm, 8 centimeters, 8 centimetres, eight cm, eight centimeters
Q6.
If two lines are perpendicular then they ______
never meet
meet at one point
Correct answer: meet at right angles at one point
meet at multiple points

Exit quiz

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6 Questions

Q1.
Match the word to its definition
Correct Answer:perimeter,the distance around a 2D shape

the distance around a 2D shape

Correct Answer:area,the size of the surface

the size of the surface

Correct Answer:parallelogram,the quadrilateral with two pairs of parallel and equal sides

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?
All four lengths
Two parallel lengths
Correct answer: 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
Correct answer: False
Q4.
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
Q5.
A parallelogram with four interior angles, each equal to 90 degrees, is called a
Correct Answer: rectangle, square
Q6.
Calculate the area and perimeter of this parallelogram.
An image in a quiz
Area = 48 m$$^2$$ and perimeter = 24 m
Correct answer: Area = 48 m$$^2$$ and perimeter = 36 m
Area = 80 m$$^2$$ and perimeter = 24 m
Area = 80 m$$^2$$ and perimeter = 36 m