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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...