New
New
Know that a rectangle is a four-sided polygon with four right angles
I can identify a rectangle as a four-sided polygon with four right angles.
Lesson 6 of 10
New
New
- Year 3
Know that a rectangle is a four-sided polygon with four right angles
I can identify a rectangle as a four-sided polygon with four right angles.
Lesson details
Key learning points
- A polygon is a 2D shape made up of 3 or more sides.
- A rectangle is a 4-sided polygon with 4 right angles.
- A 4-sided shape with fewer than 4 right angles is not a rectangle.
- A right angle is marked with a symbol inside the angle.
Keywords
Polygon - A polygon is a 2D shape made up of 3 or more straight sides.
Rectangle - A rectangle is a 2D shape with four straight sides and four right angles.
Common misconception
Pupils need to look at the interior angles in the shape. They may think that an interior angle of 270° is a right angle.
Explain to pupils that we need to measure the interior angles of a shape. Show them examples of this (e.g. an arrowhead) to illustrate.
In this lesson, pupils investigate 2D shapes and try to find right angles. Encourage pupils to check all of the angles, rotating shapes and using right-angle measurers, which can be hand made or even cut from the corner of a piece of paper.
Teacher tip
Equipment
Pupils may need access to the following resources: right angle measurers, mirrors, rulers and scissors.
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.Which of these shapes are triangles?
Which of these shapes are triangles?
b
c
Q2.Which of these shapes are quadrilaterals?
Which of these shapes are quadrilaterals?
a
d
Q3.Which of these shapes has just one right angle?
Which of these shapes has just one right angle?
a
b
c
Q4.Which of these shapes has more than one right angle?
Which of these shapes has more than one right angle?
a
d
Q5.True or false. This shape has one line of symmetry.
True or false. This shape has one line of symmetry.
False
Q6.How many right angles does this shape have?
How many right angles does this shape have?
Assessment exit quiz
6 Questions
Q1.Which symbol is used to show a right angle?
Which symbol is used to show a right angle?
a
c
d
Q2.Which of these shapes are rectangles?
Which of these shapes are rectangles?
a
c
Q3.Which of these shapes are not rectangles?
Which of these shapes are not rectangles?
b
d
Q4.Which of these statements are true for all rectangles?
Which of these statements are true for all rectangles?
They only have one line of symmetry.
They have 4 sides the same length.
Q5.How many right angles does this shape have?
How many right angles does this shape have?
Q6.How many right angles in total do these 3 shapes have?
How many right angles in total do these 3 shapes have?
