Comments

Relative positions of two lines


In space, two distinct lines can beoncurrent, parallel or reverse:




We have to consider two particular cases:

  • perpendicular lines:

  • orthogonal lines:


Euclid's Postulate or Parallel Lines

P10) Given a straight line r and a point P r there is a single straight line s, drawn by P, such that r // s:


Next: Determining a Plan