Because he thought they were unnatural.
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.
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.
Meridian
A crossing or a zebra crossing.
An apeirogon. Apeirogons are degenerate polygons that probably appear as never ending straight lines
transversal
The straight path that light travels is called a ray. It represents the direction of light propagation in a particular medium or space.