Category: geometry



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

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