There are three main points of view in literature:
The most commonly used viewpoints are First Person and Third Person.
First Person, Second Person, Third Person or First Person, Third Person, Omniscient.
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It is the circumcentre of the triangle formed by the three points. Draw the perpendicular bisectors of two of the lines joining the three points. They will meet at the point that is equidistant from the three points.
A triangle? Three lines that intersect in three points.
Three points can determine a plane but not 3-d space.
A plane is named by three points in the plane that is not on the same line.
No. A trinagle does not require four points, three are sufficient. And any three points, if they are not colinear, must be coplanar.