# Distance Between Parallel Lines: Lesson (Geometry Concepts)

Discover more at www.ck12.org: http://www.ck12.org/geometry/Distance-Between-Parallel-Lines/.

Here you’ll learn that the shortest distance between two parallel lines is the length of a perpendicular line between them.

This video gives more detail about the mathematical principles presented in Distance Between Parallel Lines.

This is part of CK-12’s Geometry: Parallel and Perpendicular Lines. See more at:

1. Parallel and Skew Lines:
http://www.ck12.org/geometry/Parallel-and-Skew-Lines/

2. Perpendicular Lines:
http://www.ck12.org/geometry/Perpendicular-Lines/

3. Corresponding Angles:
http://www.ck12.org/geometry/Corresponding-Angles/

4. Alternate Interior Angles:
http://www.ck12.org/geometry/Alternate-Interior-Angles/

5. Alternate Exterior Angles:
http://www.ck12.org/geometry/Alternate-Exterior-Angles/

6. Same Side Interior Angles:
http://www.ck12.org/geometry/Same-Side-Interior-Angles/

7. Slope in the Coordinate Plane:
http://www.ck12.org/geometry/Slope-in-the-Coordinate-Plane/

8. Parallel Lines in the Coordinate Plane:
http://www.ck12.org/geometry/Parallel-Lines-in-the-Coordinate-Plane/

9. Perpendicular Lines in the Coordinate Plane:
http://www.ck12.org/geometry/Perpendicular-Lines-in-the-Coordinate-Plane/

10. Distance Formula in the Coordinate Plane:
http://www.ck12.org/geometry/Distance-Formula-in-the-Coordinate-Plane/

11. Distance Between Parallel Lines:
http://www.ck12.org/geometry/Distance-Between-Parallel-Lines/

Watch the whole series of CK-12’s Geometry videos: https://www.youtube.com/playlist?list=PLhWx3LZhlpsfZglz0JcMu7AMqcROsISuG