Just like line segments or lines, you just need two points to name them. Line
---.-----.-----------------.-------------->
A B C D
Line= AB Line= BC Ray= CD
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Two points are sufficient.
in your leaving cert how many points are needed to be an interior designer
one point can form a line! horizontally or vertically... but a line doesn't need any points.
It takes three points to make a plane. The points need to be non-co-linear. These three points define a distinct plane, but the plane can be made up of an infinite set of points.
Answer: the name of a line confers to only 2 points and the intersection of two planes is a line. (updated)