New
New
Identify different types of triangle
I can identify different types of triangles and describe their properties.
Lesson 1 of 10
New
New
- Year 4
Identify different types of triangle
I can identify different types of triangles and describe their properties.
Lesson details
Key learning points
- All triangles have 3 straight sides and 3 vertices.
- Equilateral triangles have 3 equal sides and 3 equal angles.
- Isosceles triangles have 2 equal sides and 2 equal angles.
- Scalene triangles have no equal sides and no equal angles.
Keywords
Equilateral triangle - Equilateral triangles have 3 equal sides and 3 equal angles.
Isosceles triangle - Isosceles triangles have 2 equal sides and 2 equal angles.
Scalene triangle - Scalene triangles have no equal sides and no equal angles.
Common misconception
Some children may find it harder to recognise the type of triangle when they are drawn in different positions and orientations.
Allow time for children to manipulate the triangles so that they can see them in different orientations and build their understanding of the properties of each type of triangle.
There are opportunities throughout this lesson for children to explore the properties of triangles using angle strips and circular peg boards. If you do not have circular peg boards to hand, encourage use of those in the 'additional materials'. Children can achieve the same by drawing on these.
Teacher tip
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.The corners of a shape are called the
The corners of a shape are called the
properties
symmetry
sides
Q2.Which of the statements are true for all polygons?
Which of the statements are true for all polygons?
They are 3D shapes.
Q3.Match the polygon with the number of sides that it has.
Match the polygon with the number of sides that it has.
Q4. A right angle is the same as a __________ turn.
A right angle is the same as a __________ turn.
whole
three-quarter
half
Q5.Match the names of the polygons with their properties
Match the names of the polygons with their properties
Q6.Which of these shapes are quadrilaterals?
Which of these shapes are quadrilaterals?
triangle
Assessment exit quiz
6 Questions
Q1.Which of these statements are true for all triangles?
Which of these statements are true for all triangles?
They have 3 rounded corners.
They have 2 sides the same length.
Q2.All triangles have 3 straight sides and 3 vertices. Which of the following are triangles?
All triangles have 3 straight sides and 3 vertices. Which of the following are triangles?
b
c
Q3.Match the triangles to the correct description.
Match the triangles to the correct description.
Q4.An equilateral triangle has 3 sides and 3 angles that are __________.
An equilateral triangle has 3 sides and 3 angles that are __________.
curved
different
Q5.Which triangle has no equal sides or angles?
Which triangle has no equal sides or angles?
equilateral
isosceles
Q6.Match the type of triangle to its properties.
Match the type of triangle to its properties.
