Grade 4 · Unit 8: Location and transformation

Symmetry and reflection

Reflect shapes in mirror lines.

Reflections in water

A calm river reflects boats like a mirror. The reflection is the same size, flipped over. The water surface is the mirror line.

Reflecting on a grid

Count squares from each corner to the mirror line. Count the same on the other side. Join the points to complete the reflection.

Diagonal mirror lines

Lines of symmetry can be vertical, horizontal or diagonal. A square has 2 diagonal lines of symmetry. Turn your paper to check diagonal reflections.

Rotational symmetry

Turn tracing paper around the centre. Count how many times the shape fits. This is the order of rotational symmetry.

What I learnt

• I can reflect shapes in vertical, horizontal and diagonal lines.
• I can find the order of rotational symmetry.