Question

At an angle of 90 degrees at a given line.

The same thing except through a plane.

Answer 1

The angle between a line and a plane is the complement of the angle between the line and the normal vector of the plane.

Step-by-step explanation:

The angle between a line and a plane can be defined as the angle between the line and a perpendicular line to the plane. This angle is measured as the complement of the angle between the line and the normal vector of the plane. For example, if the angle between the line and the normal vector is X degrees, then the angle between the line and the plane is 90 degrees - X degrees.