How do we use the special segments in triangles?

Special Segment In Triangles have three main uses Median, Altitude & Angle Bisector 

• MEDIAN
  - The vertex often angle to the midpoint of the opposite side.
     EX ://  Line1 will go from point C to the middle of A&B (D)
  
• ALTITUDE
   - The height of a triangle meets the "ground" at a right angle.
• ANGLE BISECTOR
  - Bisects on angle in half creating two congruent angles.
    EX :// Line 1 goes from point A1 to T1  both sides are congruent to each other

For more help check these links 

• http://oxfordhsmath.weebly.com/uploads/8/6/0/3/8603550/lesson_11.pdf
• http://www.cliffsnotes.com/study_guide/Proportional-Parts-of-Triangles.topicArticleId-18851,articleId-18813.html 
• http://www.nelson.com/school/elementary/mathK8/quebec/0176237879/documents/NM8SB_10A.pdf 
• http://www.youtube.com/watch?v=imKupbXQ18I 
• http://www.youtube.com/watch?v=Uruz_XurwiQ&feature=fvwrel