Identify different types of triangle | Maths | Quizalize & Oak National Academy

Starter quiz

The corners of a shape are called the ______
- vertices ✓
- properties
- symmetry
- sides
Which of the statements are true for all polygons?
- They have three or more straight sides. ✓
- They are 2D shapes. ✓
- They are 3D shapes.
- They have sides that join at vertices. ✓
Match the polygon with the number of sides that it has.
- triangle
  
  ⇔
  
  3 ✓
- quadrilateral
  
  ⇔
  
  4 ✓
- pentagon
  
  ⇔
  
  5 ✓
- hexagon
  
  ⇔
  
  6 ✓
- octagon
  
  ⇔
  
  8 ✓
A right angle is the same as a __________ turn.
- whole
- quarter ✓
- three-quarter
- half
Match the names of the polygons with their properties
- A polygon with 4 vertices is called
  
  ⇔
  
  a quadrilateral. ✓
- A polygon with 5 vertices is called
  
  ⇔
  
  a pentagon. ✓
- A polygon with 6 vertices is called
  
  ⇔
  
  a hexagon. ✓
- A polygon with 8 vertices is called
  
  ⇔
  
  an octagon. ✓
Which of these shapes are quadrilaterals?
- square ✓
- rectangle ✓
- triangle
- trapezium ✓
- parallelogram ✓

Exit quiz

Which of these statements are true for all triangles?
- They have 3 straight sides. ✓
- They have 3 rounded corners.
- They have 2 sides the same length.
- They have 3 vertices. ✓
All triangles have 3 straight sides and 3 vertices. Which of the following are triangles?
- a ✓
- b
- c
- d ✓
Match the triangles to the correct description.
- A
  
  ⇔
  
  This triangle has no equal sides and no equal angles. ✓
- B
  
  ⇔
  
  This triangle has three equal sides and three equal angles. ✓
- C
  
  ⇔
  
  This triangle has two equal sides and two equal angles. ✓
An equilateral triangle has 3 sides and 3 angles that are __________.
- curved
- equal ✓
- different
Which triangle has no equal sides or angles?
- equilateral
- isosceles
- scalene ✓
Match the type of triangle to its properties.
- scalene
  
  ⇔
  
  no equal sides and no equal angles ✓
- isosceles
  
  ⇔
  
  two equal sides and two equal angles ✓
- equilateral
  
  ⇔
  
  three equal sides and three equal angles ✓

Worksheet

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Presentation

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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.

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.

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.