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Brainlag Learn / GCSE Maths

Angles, polygons and parallel lines

Angle facts on lines, at points and in triangles, angles with parallel lines, quadrilaterals, interior and exterior angles of polygons, and chains of reasoning.

Lessons

  1. Angle factsAngles on a straight line, round a point, vertically opposite and in triangles, including equations in x. 20 min, free
  2. Angles and parallel linesAlternate, corresponding and co-interior angles, with the reasons named properly. 25 min, with the Graphing Calculator, free
  3. Triangles and quadrilateralsThe exterior angle of a triangle, the angle sum of a quadrilateral, and the properties of the special quadrilaterals. 25 min, Plus
  4. Angles in polygonsInterior angle sums, interior and exterior angles of regular polygons, and working back to the number of sides. 25 min, with the Scientific Calculator, Plus
  5. Angle reasoningChain several angle facts together, with a reason for each step, including algebra, ratios and polygons. 25 min, Plus

Practise and test

AQA, Pearson Edexcel and OCR are registered trade marks of their owners. Brainlag Learn is independent: it is not affiliated with or endorsed by any exam board, and every question on it is original.