No. Any order works.
I've often seen the letter O used as the center of a circle, and people talk about the line OA or the line OB.
If the point is not on the line, then no they are not collinear. But if that point is on the line, then they are collinear. Points on the same line are collinear. Points not on the same line are not collinear or non collinear.
Yes, a line and a point can be on the same line. A point can be placed on a line. It will then be collinear.
A point lies on a line if the coordinates of the point satisfy the equation of the line.
Since it is possible to draw a line through any two points, if there is a point that does not lie on the same line, it must be a third point.
The same line.
Ab and Ba are the same line because there are no endpoints to a line. Therefore, you can reverse the order of the letters. So, Cd and Dc are not the same ray because the first letter is the endpoint. So on ray Cd, point C is the endpoint and d is a point on the line coming from the endpoint. On ray Dc, D is the endpoint.
ray
That's the whole point. "Collinear" means they are on the same line.
Alternates are fill-in-the-blank version of this Q. are the same distance from a point and a line
No. Every point on a contour line has the same elevation.
The intersection of two lines is always a point or the line itself. The intersection of a line with plane also the same as above.
No. It changes by double the (perpendicular) distance from the point to the line.