Tangent.
Because he thought they were unnatural.
A straight line that touches a curve but continues without crossing it is called a "tangent." At the point of contact, the tangent line has the same slope as the curve, indicating that it just grazes the curve rather than intersecting it.
A line of interception.
Perpendicular
If they measure 90 degrees then they are perpendicular. Other than that they are just intersecting lines
An intersection
Perpendicular lines.
Straight
Light travels in straight lines that we call rays.
Because he thought they were unnatural.
a sex when a male is on top of a female
A polygon is a plane area bounded by straight lines. Two straight lines cannot define a closed shape. There cannot, therefore by a polygon with only two sides.
A straight line that touches a curve but continues without crossing it is called a "tangent." At the point of contact, the tangent line has the same slope as the curve, indicating that it just grazes the curve rather than intersecting it.
Meridian
A crossing or a zebra crossing.
transversal
An apeirogon. Apeirogons are degenerate polygons that probably appear as never ending straight lines