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Videos on geometry. Basic understanding of Algebra I necessary. After this, you'll be ready for Trigonometry.

Self-Study Content
  1. Euclid as the Father of Geometry

    More free lessons at: http://www.khanacademy.org/video?v=WqzK3UAXaHs Euclid and his Elements (and h

  2. Language and Notation of Basic Geometry

    More free lessons at: http://www.khanacademy.org/video?v=il0EJrY64qE Understanding basic ideas in g

  3. Lines, Line Segments, and Rays

    More free lessons at: http://www.khanacademy.org/video?v=JcqCf762y9w Difference between lines, line

  4. Language and Notation of the Circle

    More free lessons at: http://www.khanacademy.org/video?v=U2W7HPyC0cM Formal definition of a circle.

  5. Angle Basics

    More free lessons at: http://www.khanacademy.org/video?v=H-de6Tkxej8 Definition of an angle. How t

  6. Measuring Angles in Degrees

    More free lessons at: http://www.khanacademy.org/video?v=92aLiyeQj0w How to measure an angle in deg

  7. Using a Protractor

  8. Measuring Angles

    More free lessons at: http://www.khanacademy.org/video?v=wJ37GJyViU8 Using the KA virtual protracto

  9. Complementary and Supplementary Angles

    Complementary and supplementary angles Let's add some tools to our geometry tool belt. Here's a thor

  10. Angles at the intersection of two lines

    Introduction to vertical angles By using our knowledge of supplementary, adjacent, and vertical angl

  11. Proof-Vertical Angles are Equal

    More free lessons at: http://www.khanacademy.org/video?v=wRBMmiNHQaE Proving that vertical angles a

  12. Angles Formed by Parallel Lines and Transversals

    More free lessons at: http://www.khanacademy.org/video?v=H-E5rlpCVu4 Parallel lines, transversal li

  13. Proof - Sum of Measures of Angles in a Triangle are 180

    Proof that the sum of the measures of the angles in a triangle are 180

  14. Triangle Angle Example 1

    More free lessons at: http://www.khanacademy.org/video?v=hmj3_zbz2eg Figuring out angles in a trian

  15. Triangle Angle Example 2

    More free lessons at: http://www.khanacademy.org/video?v=eTwnt4G5xE4 Another example finding angles

  16. Triangle Angle Example 3

    More free lessons at: http://www.khanacademy.org/video?v=iqeGTtyzQ1I Multiple ways to solve for the

  17. Challenging Triangle Angle Problem

    More free lessons at: http://www.khanacademy.org/video?v=95logvV8nXY Interesting problem finding th

  18. Proof - Corresponding Angle Equivalence Implies Parallel Lines

    More free lessons at: http://www.khanacademy.org/video?v=9_3OxtdqmqE Proof by contradiction that co

  19. Finding more angles

    More free lessons at: http://www.khanacademy.org/video?v=0gzSreH8nUI Example of angle hunting!

  20. Sum of Interior Angles of a Polygon

    More free lessons at: http://www.khanacademy.org/video?v=qG3HnRccrQU Showing a generalized way to f

  21. Congruent Triangles and SSS

    More free lessons at: http://www.khanacademy.org/video?v=CJrVOf_3dN0 What it means for triangles to

  22. SSS to Show a Radius is Perpendicular to a Chord that it Bisects

    More free lessons at: http://www.khanacademy.org/video?v=TgDk06Qayxw More on the difference between

  23. Other Triangle Congruence Postulates

    More free lessons at: http://www.khanacademy.org/video?v=8Ld8Csu4sEs SSS, SAS, ASA and AAS postulat

  24. Two column proof showing segments are perpendicular

    More free lessons at: http://www.khanacademy.org/video?v=fSu1LKnhM5Q Using triangle congruency post

  25. Sum of the exterior angles of convex polygon

    More free lessons at: http://www.khanacademy.org/video?v=W9B3VYdC5T8 More elegant way to find the s

  26. Finding Congruent Triangles

    More free lessons at: http://www.khanacademy.org/video?v=d5UCZ9hO8X4 Using the SSS, ASA, SAS, and A

  27. More on why SSA is not a postulate

    More free lessons at: http://www.khanacademy.org/video?v=f8svAm237xM SSA special cases including RS

  28. Congruent Triangle Proof Example

    More free lessons at: http://www.khanacademy.org/video?v=RFesGHsuFZw Proving that a point is the mi

  29. Congruent Triangle Example 2

    More free lessons at: http://www.khanacademy.org/video?v=Xc3oHzKXVh8 Showing that segments have the

  30. Congruent legs and base angles of Isosceles Triangles

    More free lessons at: http://www.khanacademy.org/video?v=7UISwx2Mr4c Showing that congruent legs im

  31. Equilateral Triangle Sides and Angles Congruent

    More free lessons at: http://www.khanacademy.org/video?v=CYNUwiUzlPk Showing that all of the angles

  32. Equilateral and Isosceles Example Problems

    More free lessons at: http://www.khanacademy.org/video?v=7FTNWE7RTfQ Three example problems involvi

  33. Another Isosceles Example Problem

    More free lessons at: http://www.khanacademy.org/video?v=ceDV0QBpcMA Possible angles for an isoscel

  34. Example involving an isosceles triangle and parallel lines

    More free lessons at: http://www.khanacademy.org/video?v=CVKAro3HUxQ Integrating what we know about

  35. Figuring out all the angles for congruent triangles example

    More free lessons at: http://www.khanacademy.org/video?v=aDCXPdzyS0s Another example of using congr

  36. Perimeter and Area Basics

    More free lessons at: http://www.khanacademy.org/video?v=LoaBd-sPzkU Definitions of perimeter and a

  37. Triangle Area Proofs

    More free lessons at: http://www.khanacademy.org/video?v=YOYQys52sPs Proving that the area of any t

  38. Interesting Perimeter and Area Problems

    More free lessons at: http://www.khanacademy.org/video?v=vWXMDIazHjA Three example problems involvi

  39. Koch Snowflake Fractal

    More free lessons at: http://www.khanacademy.org/video?v=azBNsPa1WC4 A shape that has an infinite p

  40. Area of an Equilateral Triangle

    More free lessons at: http://www.khanacademy.org/video?v=UKQ65tiIQ6o Finding the formula for the ar

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