A straight line other than a line segment which does have end points.
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A line segment
In a close figure it is the set of points inside the figure.
In terms of Euclidian geometry, no lines have end points. A line segment has end points, as it is a section of a defined line of points.
Triangle: A figure formed by exactly three (non-colinear) points joined by line segments is a triangle. A figure formed by three or more points is generally called a polygon. Of course, if all of the points are co-linear then there is not much of a figure. A polygon has 3 or more sides.
the answer is translation