Always.
The hard part is form a right angle. To do that draw a line with two points on it. Draw a circle around each point. Draw a line through the two points at which the circles intersect.
Yes, two points are always collinear. You can draw a line through any two points.
Any two points are always collinear, since you can draw a straight line passing through any two points.
If you have two points, a and b, you can draw only one line that will go through both points. Or in other words, two points define a line.
Colinear points mean that if you draw a (really long) line between any two of them, the line will pass through the others. Or simply: there can exist a straight line that can pass through all of them. These are colinear points: . .... .. One line can pass through all of them: These ar not colinear points: :. If I try to connect any two of them with a line, the third point will not lie on that line.
collinear
Collinear means they are on the same line. Of course we can draw a line through any two points so they can be collinear. However, if we have a line, we can easily find another point on that line and a point not on the line. Only the one on the line is called collinear.
A line contains an infinite number of points but it takes only two points to determine a line.
You can only draw one straight line through any two given points.
It's not possible to draw two points that aren't on the same straight line.
No.
Two points with a single line connecting them.