Geometry+5-4

=**__Triangle Inequality__**=

media type="youtube" key="mUasyhcnXAw?fs=1" height="385" width="480" 1 identify sides of a triangle 2determine possible side length The distance between point p and line L is measured along a perpendicular segment from the point to the line. it was accepted without proof that PA was the shortest segment from P to L. the theorems involving relationships between the angles and sides of a treantle can now be used to prove that a perpendicular segment is the shortest distance between a point and a line.