Category: geometry



  1. 3D geometry
  2. Angle at the centre of a circle is twice the angle at the circumference
  3. Angle in a semicircle is 90 degrees
  4. Angles in the same segment of a circle are equal
  5. Area and circumference of circles
  6. Area and perimeter
  7. Area and perimeter of quadrilaterals
  8. Area and perimeter of triangles
  9. Circle geometry
  10. Congruent and similar shapes
  11. Congruent shapes
  12. Congruent triangles
  13. Cube
  14. Cube surface area and net
  15. Decagons - polygons with 10 sides
  16. Dodecagons - polygons with 12 sides
  17. Geometry
  18. Geometry basic rules
  19. Hendecagons - polygons with 11 sides
  20. Heptagons - polygons with 7 sides
  21. Hexagons - polygons with 6 sides
  22. Interior and exterior angles of a polygon
  23. Line symmetry
  24. Loci
  25. Locus of points a fixed distance from a given line
  26. Locus of points a fixed distance from a given point
  27. Locus of points an equal distance between 2 lines
  28. Locus of points an equal distance between 2 points
  29. More quadrilaterals
  30. Nonagons - polygons with 9 sides
  31. Octagons - polygons with 8 sides
  32. Opposite angles in a cyclic quadrilateral add up to 180°
  33. Other types of polygon
  34. Parallel lines
  35. Parts of a circle
  36. Pentagons - polygons with 5 sides
  37. Perpendicular bisector of a chord
  38. Polygons
  39. Quadrilateral family tree
  40. Quadrilaterals
  41. Regular polygons
  42. Regular tessellations
  43. Rotational symmetry
  44. Similar shapes
  45. Similar triangles
  46. Similar triangles proof
  47. Star polygons
  48. Tangent and radius of a circle meet at 90°
  49. Tessellations and symmetry
  50. Transformations
  51. Translation
  52. Triangles
  53. Two radii form an isosceles triangle
  54. Two tangents from a point have equal length
  55. n-gons - polygons with any number of sides


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