...parallel to each other.
A line.
Parallel, Perpendicular, and Planes.
The solid enclosed by this surface and by two planes perpendicular to the axis is also called a cylinder.
Coordinate planes
perpendicular
Perpendicular
...parallel to each other.
A line.
No, perpendicular planes intercept at only one point. Parallel planes do not intersect at all.
Parallel, Perpendicular, and Planes.
No, "perpendicular" is not a preposition. It is an adjective that describes a relationship between two lines or planes that intersect at a right angle.
The solid enclosed by this surface and by two planes perpendicular to the axis is also called a cylinder.
Coordinate planes
no planes are not perpendicular to each other because for air resistance the planes are designed in a such way that air is avoided to back side and they are inclined to each other.
Yes
Two planes are parallel if the perpendicular distance between them remains constant. This is not a British definition but a mathematical definition and so is valid everywhere.