Postulate 12
If two distinct lines intersect, then their intersection is exactly one point.
Postulate 13 parallel postulate
If there is a line and a point not on the line, then there is exactly one line through the point parallel to the given line.
Postulate 14 perpendicular postulate
If there is a line and a point not on the line, then there is exactly one line through the point perpendicular to the given line.