Year 5

# Identifying lines of symmetry in 2D shapes

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## Lesson details

### Key learning points

- In this lesson, we will explore the meaning of lines of symmetry and addresses common misconceptions.

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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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### 5 Questions

Q1.

What is the name given to a triangle with 3 equal sides?

Right angled triangle

Scalene triangle

Trapezium

Q2.

What is the name given to a triangle which has the following three angles: 80°, 40° and 60° ?

Equilateral triangle

Isosceles triangle

Right angled triangle

Q3.

If a triangle has the angles of 90° and 60°, what is the third angle?

180°

40°

90°

Q4.

Which of these are NOT interior angles of a triangle?

40°, 55°, 75°

60°, 60° and 60°

70° , 70° and 40°

80°, 20°, 70°

Q5.

A right angled triangle can also be ...

a scalene or an equilateral triangle

an equilateral triangle

an isosceles or an equilateral triangle

### 5 Questions

Q1.

Which statement best describes a line of symmetry?

A curved line

A long line

A straight line that passes through the centre of the shape so that one part is different to the other part

Q2.

How many lines of symmetry does a square have?

0

1

2

Q3.

Which of the following statements is correct?

All regular shapes have exactly 2 lines of symmetry

Only 3d shapes have lines of symmetry

Only regular shapes have lines of symmetry

Q4.

Which of the following statements is incorrect?

An equilateral triangle has 3 lines of symmetry

An isosceles triangle has 2 lines of symmetry

Irregular shapes can have lines of symmetry

Q5.

Which os the statements about triangles is correct?

A scalene triangle has 2 lines of symmetry

An equilateral triangle has exactly 2 lines of symmetry

An isosceles triangle has 0 lines of symmetry