Skip to content
Oak National Academy
Oak National Academy
Teachers
Pupils
New
New
Year 7

Checking understanding of perimeter and area

You can explain the properties of various polygons

Download all resources
Share activities with pupils
New
New
Year 7

Checking understanding of perimeter and area

You can explain the properties of various polygons

Download all resources
Share activities with pupils

Lesson details

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.

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.

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.

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.
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).

Video

Skip video

Loading...

Starter quiz

Download 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

Exit quiz

Download exit quiz

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