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2-D shapes (age 8+)

CONCEPTUAL
Mathematics›Geometry|Ages 8—10|ID: mt_hRZyKvz1KN

Identify lines of symmetry in 2-D shapes presented in different orientations; recognise line-symmetric figures and draw lines of symmetry

Mastery Evidence

  • Find all lines of symmetry in a rectangle, square, and equilateral triangle
  • Determine whether a given shape has a line of symmetry when rotated
  • Identify which shapes in a set have exactly one line of symmetry
  • Determine how many lines of symmetry a regular hexagon has
  • Draw all lines of symmetry for a given figure
  • Identify which figures from a set are not line-symmetric

Assessment Prompt

“If [child] is given a picture of a butterfly or a star shape, can they draw the line (or lines) where you could fold it exactly in half so both sides match?”

Prerequisites2

Show full prerequisite tree
  • 2-D shapes (age 6+) hard

    Vertical line symmetry in Y2 is prerequisite to finding symmetry lines in multiple orientations

    • Angles in triangles (age 6+) soft

      Understanding defining attributes supports describing shape properties formally

      • 2-D shapes hard

        Distinguishing defining vs non-defining attributes requires knowing common 2-D shape names first

      • 3-D shapes (age 5+) hard

        Identifying defining attributes builds on informal analysis and comparison of shapes

        • 2-D shapes hard

          Analysing and comparing shapes requires being able to name them first

        • 3-D shapes hard

          Analysing 3-D shapes requires recognising and naming them

    • 2-D shapes hard

      Describing properties of 2-D shapes (sides, symmetry) requires knowing the shapes first

    • 3-D shapes (age 5+) hard

      Formal property description extends informal analysis of sides and vertices

      • 2-D shapes hard

        Analysing and comparing shapes requires being able to name them first

      • 3-D shapes hard

        Analysing 3-D shapes requires recognising and naming them

  • Transformations on a grid hard

    Identifying lines of symmetry requires the ability to draw and interpret reflection on a grid

Unlocks1