Explore, sort and classify triangles
I can sort triangles in different ways based on their properties.
Explore, sort and classify triangles
I can sort triangles in different ways based on their properties.
Lesson details
Key learning points
- There are three types of triangle - equilateral, isosceles and scalene.
- Some triangles can also be described as right-angled triangles if one of the angles is equal to 90°
- Right-angled triangles can be classified as scalene or isosceles.
Common misconception
Children might find it difficult to create triangles with equal angles.
Allow time to play and explore constructing triangles using items such as lolly sticks and matchsticks. Develop children's understanding of angles in a triangle using angle strips to check whether the angles are equal or not.
Keywords
Right-angled triangle - A right-angled triangle has one 90° angle. Right-angled triangles can be classified as isosceles or scalene.
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.
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
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Starter quiz
6 Questions
no equal sides and no equal angles
two equal sides and two equal angles
three equal sides and three equal angles
Exit quiz
6 Questions
a right-angled isosceles triangle
an equilateral triangle
a right-angled scalene triangle
