Explore, sort and classify triangles
I can sort triangles in different ways based on their properties.
- Year 4
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.
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.
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.
Licence
Lesson video
Loading...
Prior knowledge starter quiz
6 Questions
Q1.Which of these statements describe the properties of all triangles?
Q2.True or false. The images are all triangles.
Q3.Match the different triangles to their properties.
Q4.How many equal sides and equal angles does an isosceles triangle have?
Q5.A triangle with 3 equal sides and 3 equal angles is called an __________ triangle.
Q6.How many equal sides and equal angles does a scalene triangle have?
Assessment exit quiz
6 Questions
Q1.Which of these is true for all right-angled triangles?
Q2.These triangles have been sorted. What type of triangles are in this set?
Q3.These triangles have been sorted. Which triangle has been incorrectly sorted?
Q4.True or false. Right-angled triangles can be scalene or isosceles.
Q5.Jacob has made these triangles. Match the triangle to the correct description.
Q6.This shape is a right-angled triangle.
