Year 8 · Maths · beta

Geometrical properties: polygons

In this unit pupils will investigate internal and external angles of polygons and angles made with a transveral and parallel lines. Pupils will develop their ability to formally prove properties of polygons to generalise.

This is an attributed Oak National Academy lesson sequence, not a completed or academically approved DASKEREL course. Supporting transcripts may depend on video, images, practical equipment or teacher explanation. Follow each lesson’s supervision guidance. For religious education and RSHE, follow the school’s syllabus, policy and safeguarding procedures.

Prior knowledge

  • Identify and classify polygons by sides and angles
  • Use angle rules (interior, exterior)
  • Calculate sum of angles and solve problems using reasoning

Source curriculum references

  • Use standard units of mass, length, time, money and other measures, including with decimal quantities
  • Draw and measure line segments and angles in geometric figures, including interpreting scale drawings
  • Describe, sketch and draw using conventional terms and notations: points, lines, parallel lines, perpendicular lines, right angles, regular polygons, and other polygons that are reflectively and rotationally symmetric
  • Use the standard conventions for labelling the sides and angles of triangle ABC, and know and use the criteria for congruence of triangles
  • Apply the properties of angles at a point, angles at a point on a straight line, vertically opposite angles
  • Understand and use the relationship between parallel lines and alternate and corresponding angles
  • Derive and use the sum of angles in a triangle and use it to deduce the angle sum in any polygon, and to derive properties of regular polygons

Oak source metadata. DASKEREL has not independently verified school-level coverage.

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