No.
"Common" implies shared between two (or more) objects. One item - ray or whatever - cannot have a common anything.
They can have only one point in common.
a ray starts at a point and goes on forever
Yes (supposing that by side you mean ray...angles don't have sides because they are 2D, not 3D.) If you have a point and you draw four random rays from that point, that only meat at that point, then you would have created four angles. The two angles on opposite sides of the point will share a vertex, but not a RAY.
The point at the end of a ray is called the endpoint. It is the specific location where the ray ends or terminates.
A ray has one fixed point, which is its endpoint. This is the point from which the ray extends infinitely in one direction. The other side of the ray continues indefinitely, so it does not have a fixed point on that end.
No, ray CD and ray DC are not the same. A ray is defined by its starting point and extends infinitely in one direction. Ray CD starts at point C and extends through point D, while ray DC starts at point D and extends through point C, thereby having different directions.
A ray has only one end point.
There is no end point, a ray is never ending but has a point to represent the beginning
It depends on what the name of the initial point is because that defines the direction of the ray. If the initial point is c, then the ray must be called cd, but if the initial point is d, then the ray must be called dc.
The ray opposite to line CD is referred to as ray DC. A ray has a starting point and extends infinitely in one direction, so ray DC would begin at point D and extend in the direction towards point C. This means it moves in the opposite direction of ray CD, which starts at point C and moves towards point D.
A ray.
point