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What is a point that does not lie on the same 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.
How do you prove the 3 points are colinear?
To prove that three points are colinear, pick two points and form the equation of the line they describe, and then see if the third point lies on that line.
Does collinear have three points?
Collinear means in the same straight line. And since a line consists of an infinite number of points, collinear has an infinite number of points - not just 3. n the other hand, while any two points must be collinear (they have to both be on the line that joins them), it is always possible to find a third point which is not collinear with the first two (Euclid).
Is a line and point collinear?
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.
How can you find the line of reflection if you know the images of some points?
Draw a line joining a point and its image and find its midpoint. Repeat for another pair of point and its image. The line joining these midpoints is the line of reflection.
