Enrich · Stage 5 · Introduction to networks (Path)

Enrich Describe and apply Euler’s formula for planar graphs: v - e + f = 2, where v = vertices, e = edges and f = faces

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• Interactive toolEnrichmentEnrich
  Mathigon: Handshakes and dating
  Mathigon (Amplify) · Interactive (browser) · Free · Link checked 2026-10-15 · Hands-on, No prep
  Use it for: Extension puzzles on counting edges and degree sums.
• Interactive toolEnrichmentEnrich
  Mathigon: Map colouring
  Mathigon (Amplify) · Interactive (browser) · Free · Link checked 2026-10-15 · Hands-on, No prep
  Use it for: Enrichment: four-colour theorem and planar graph faces.
• Rich taskEnrichmentEarly finishersEnrich
  NRICH: Eulerian
  NRICH (University of Cambridge) · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling, Teacher notes
  Use it for: Low-floor, high-ceiling NRICH task extending this dot point; use for extension or a problem-solving lesson.