Lines of Symmetry on Shapes — Interactive Lesson (Year 2)

How many lines of symmetry does an equal-sided triangle have? This 30-slide interactive lesson teaches lines of symmetry, using the idea of a mirror line to make the concept concrete.

Mastering Lines of Symmetry on Shapes in Year 2 Maths

Pupils learn to recognise vertical and horizontal lines of symmetry in shapes and objects, and to identify shapes and objects that have symmetry. They learn that a shape is symmetrical if a line can be drawn through it so either side is a reflection of the other, sometimes called a mirror line, and identify the correct line of symmetry on diagrams and a symmetrical glass cup. Later activities classify shapes by how many lines of symmetry they have, from one line to more than two.

What’s Included

• 30-slide interactive geometry lesson on symmetry
• Learning objectives on recognising and identifying symmetry
• Vertical and horizontal lines of symmetry explained
• Classifying shapes by how many lines they have
• Matching and sorting activities with instant feedback

Key Benefits for Students

• Builds a clear, mirror-based understanding of the concept
• Distinguishes vertical from horizontal lines of symmetry
• Practises counting them on a range of varied shapes
• Instant feedback on answer questions

Why Teachers Love It

• No prep — ready for whole-class teaching on an interactive whiteboard
• A long, structured lesson that can be split across sessions
• Self-marking questions support independent practice
• Suits teaching, revision and homework
• A dependable foundation before reflection and rotation

Love this? You’ll love…

• Shapes and Patterns — Interactive Lesson (Year 2)
• Recognise and Name 2D Shapes — Interactive Lesson & Activities (Ages 6–7)
• 2D Shapes: Tally Charts: Maths Statistics — Activities (KS1)

A dependable addition to a Year 2 geometry topic, giving pupils a hands-on, mirror-based way into symmetry. This early understanding of symmetry supports later work on reflection and shape properties.

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FAQs

What year group is this for?
Year 2 (ages 6–7), KS1.

Does it cover both vertical and horizontal lines?
Yes — both types of line of symmetry are covered.

Is it self-marking?
Yes, with instant feedback on the questions.