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.
Perpendicular
A line of interception.
Parallel lines can have a line crossing both of them. They call that the transversal. Corresponding angles are on the same side of the transversal. Alternate are on opposite sides of the transversal.
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.
An apeirogon. Apeirogons are degenerate polygons that probably appear as never ending straight lines
transversal