The point at which the rays of an angle intersect is the vertex.
the vertex
Rays that are not parallel do not necessarily intersect. Rays have a starting point and if they diverge, they will not intersect. If they converge from their starting point, then they will eventually intersect.
two lines intersect at point b which is also end point of two rays
Rays, I believe.
as long as they intersect.
Yes
Not necessarily. The rays may not intersect.
Two collinear rays that do not intersect are called parallel rays. This will only occur for a short time, however, because they will intersect at some point.
any rays that intersect will form 4 angles
The arcs must intersect because you need a point to use with the point of the angle's vertex to make the line that intersects the angle.
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.
they intersect 1 point at a 90 degree angle at all sides