Sign in to YouTube

Geometry

by Khan Academy
  1. 85 Thumbnail

    Rhombus Diagonals

  2. 86 Thumbnail

    2003 AIME II Problem 7

  3. 87 Thumbnail

    Perpendicular Radius Bisects Chord

  4. 88 Thumbnail

    Circumcenter of a Triangle

  5. 89 Thumbnail

    Circumcenter of a Right Triangle

  6. 90 Thumbnail

    Three Points Defining a Circle

  7. 91 Thumbnail

    Point Line Distance and Angle Bisectors

  8. 92 Thumbnail

    Incenter and incircles of a triangle

  9. 93 Thumbnail

    Angle Bisector Theorem Proof

  10. 94 Thumbnail

    Inradius Perimeter and Area

  11. 95 Thumbnail

    Angle Bisector Theorem Examples

  12. 96 Thumbnail

    Medians divide into smaller triangles of equal area

  13. 97 Thumbnail

    Exploring Medial Triangles

  14. 98 Thumbnail

    Proving that the Centroid is 2-3rds along the Median

  15. 99 Thumbnail

    Median Centroid Right Triangle Example

  16. 100 Thumbnail

    Proof - Triangle Altitudes are Concurrent (Orthocenter)

  17. 101 Thumbnail

    Review of Triangle Properties

  18. 102 Thumbnail

    Euler Line

  19. 103 Thumbnail

    Euler's Line Proof

  20. 104 Thumbnail

    [Deleted Video]

  21. Thumbnail

    Common Orthocenter and Centroid

  22. 106 Thumbnail

    Quadrilateral Overview

  23. 107 Thumbnail

    Proof - Opposite Sides of Parallelogram Congruent

  24. 108 Thumbnail

    Proof - Diagonals of a Parallelogram Bisect Each Other

  25. 109 Thumbnail

    Proof - Opposite Angles of Parallelogram Congruent

  26. 110 Thumbnail

    Proof - Rhombus Diagonals are Perpendicular Bisectors

  27. 111 Thumbnail

    Proof - Rhombus Area Half Product of Diagonal Length

  28. 112 Thumbnail

    Area of a Parallelogram

  29. 113 Thumbnail

    Problem involving angle derived from square and circle

  30. 114 Thumbnail

    Area of a Regular Hexagon