3 planes together
A line.Unless the two planes are the same, in that case a plane.
2
No. Planes are 2-dimensional.
A Biplane.
Biplane
Bi-plane
2 dimensions create a single plane.
6*5/2 = 15 planes.
Depends on the type of plane you are talking about.
2 Lines in the same plane that do not meet are parallel. If 2 lines are in different planes and do not meet, then they are called skew lines.
An angle separates a plane to 3 sets: 1) Points between the 2 rays 2) Points on one of the rays 3) Points outside of the 2 rays
It did happen 2 planes crashed into the towers everyone on the plane died but not more than 1300 survived in the tower