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      Checking understanding of perimeter and area

      Lesson details

      Learning outcome

      I can explain the properties of various polygons.

      Key learning points

      1. Quadrilaterals can be described and identified using their properties.
      2. Triangles can be classified according to their properties.
      3. Polygons can be regular or irregular.

      Keywords

      • Regular - A regular polygon has sides that are all equal and interior (inside) angles that are all equal.

      • Irregular - An irregular polygon has sides that are not equal or interior (inside) angles that are not equal.

      • Quadrilateral - Quadrilaterals are polygons that have 4 sides.

      • Polygon - A polygon is a flat (2D), closed figure made up of straight line segments.

      • Parallel - Two lines are parallel if they are straight lines that are always the same (non-zero) distance apart.

      Common misconception

      Pupils may think a diamond is an example of a quadrilateral.

      Rhombus is the correct mathematical name for the shape that pupils may refer to as a diamond.

      Teacher tip

      Task 1 is best played in pairs and allows pupils to peer-check and hold each other accountable for using correct mathematical names. This not only strengthens their own understanding, but their partner's as well.

      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? The angle marked on the shape is an interior angle.

      An image in a quiz
      Correct answer: True
      False

      Q2.
      A has 6 straight sides

      Correct Answer: hexagon

      Q3.
      What is the mathematical name for this shape?

      An image in a quiz
      square
      rectangle
      Correct answer: rhombus
      diamond

      Q4.
      The unique name for an angle that measures 90 degrees is a .

      Correct Answer: right-angle, right angle

      Q5.
      What is the mathematical name for this shape?

      An image in a quiz
      Correct answer: trapezium
      rhombus
      parallelogram
      kite

      Q6.
      What is the length of the marked side of the parallelogram?

      An image in a quiz
      Correct Answer: 7 cm, 7 centimetres, 7 centimeters

      6 Questions

      Q1.
      How many sides does a quadrilateral have?

      3
      Correct answer: 4
      5
      6

      Q2.
      Two lines are if they are straight lines that are always the same (non-zero) distance apart

      Correct Answer: parallel

      Q3.
      A polygon has sides that are all equal and interior angles that are all equal

      Correct Answer: regular

      Q4.
      True or false? This shape is an octagon.

      An image in a quiz
      Correct answer: True
      False

      Q5.
      What is the length of the line marked $$b$$?

      An image in a quiz
      Correct answer: 7 cm
      6 cm
      5 cm
      4 cm

      Q6.
      Calculate the length of the marked side in the composite rectilinear shape.

      An image in a quiz
      Correct Answer: 5 cm, 5 centimeters, 5 centimetres

      To help you plan your 7 maths lesson on: Checking understanding of perimeter and area, download all teaching resources for free and adapt to suit your pupils' needs...