Q: How many points are needed to determine a unique line?

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3 points which do not all lie on the same line.

A plane can be determined by three points, as long as the three points do not lie along a single line.

2

2 points determine a line.

To determine a trajectory line, only two points are needed. These two points can be used to calculate the slope, which represents the direction and angle of the trajectory. Additional points can be used to further refine the trajectory line and estimate its accuracy.

Related questions

3 points which do not all lie on the same line.

A plane can be determined by three points, as long as the three points do not lie along a single line.

In order to draw a straight line, two unique ordered pairs are needed. This is because two unique points determine a line and an ordered pair represents a point.

2

Two. Two points determine a line. Three points determine a plane.

A line contains an infinite number of points but it takes only two points to determine a line.

2

You need two points to determine a line. A single point can have an infinite number of lines passing through it.

It takes exactly 2 distinct points to uniquely define a line, i.e. for any two distinct points, there is a unique line containing them.

In plane geometry, two points determines or defines one unique line.

2 points determine a line.

8 collinear points determine 28 unique line segments