Lines of Symmetry (Edexcel IGCSE Maths A (Modular))

Lines of Symmetry

What is line symmetry?

• Line symmetry refers to shapes that can have mirror lines added to them

  • Each side of the line of symmetry is a reflection of the other side

• Lines of symmetry can be thought of as a folding line too

  • Folding a shape along a line of symmetry results in the two parts sitting exactly on top of each other

• It can help to look at shapes from different angles; turn the page to do this

• Some questions will provide a portion of a shape and a line of symmetry, and you need to fill in the remaining half of the shape

• Be careful with diagonal lines of symmetry

  • Use tracing paper to trace the shape and then flip along the line of symmetry

• “Two-way” reflections (like part c below) occur if the line of symmetry passes through the shape