<PRE><B>Question 699964</B>
THE PROOF IS WHEN 2 OR MORE LINES SEGMENTS WITHIN ANY TRIANGLE INTERSECT AT THE SAME POINT
 DRAW A TRIANGLE ,LABEL B AT TOP OF TRIANGLE
                  LABEL A BOTTOM LEFT CORNER
                  LABEL C BOTTOM RIGHT CORNER
THEN DRAW LINES THAT INTERSECT WITHIN THE TRAINGLE AND YOU WILL
GET A BETTER UNDERSTANDING


           
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