Triangle Proportionality: Lesson (Geometry Concepts)

Discover more at www.ck12.org: http://www.ck12.org/geometry/Triangle....

Here you'll learn how to apply both the Triangle Proportionality Theorem, which states that if a line that is parallel to one side of a triangle intersects the other two sides, then it divides those sides proportionally.

This video gives more detail about the mathematical principles presented in Triangle Proportionality.

This is part of CK-12’s Geometry: Similarity.  See more at:

1. Forms of Ratios:
http://www.ck12.org/geometry/Forms-of...

2. Proportion Properties:
http://www.ck12.org/geometry/Proporti...

3. Similar Polygons and Scale Factors:
http://www.ck12.org/geometry/Similar-...

4. AA Similarity:
http://www.ck12.org/geometry/AA-Simil...

5. Indirect Measurement:
http://www.ck12.org/geometry/Indirect...

6. SSS Similarity:
http://www.ck12.org/geometry/SSS-Simi...

7. SAS Similarity:
http://www.ck12.org/geometry/SAS-Simi...

8. Triangle Proportionality:
http://www.ck12.org/geometry/Triangle...

9. Parallel Lines and Transversals:
http://www.ck12.org/geometry/Parallel...

10. Proportions with Angle Bisectors:
http://www.ck12.org/geometry/Proporti...

11. Dilation:
http://www.ck12.org/geometry/Dilation/

12. Dilation in the Coordinate Plane:
http://www.ck12.org/geometry/Dilation...

13. Self-Similarity:
http://www.ck12.org/geometry/Self-Sim...

Watch the whole series of CK-12's Geometry videos: CK-12 Geometry Concepts

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