Discussion
Which of the following has a definite length ?
Answer: D
A line segment has a definite length.
A line segment is the part of a line between two end points, so it can be measured, for example AB = 5 cm.
A line extends without end in both directions, so it has no definite length. A ray has one end point but extends without end in the other direction, so it cannot be measured either. A plane is a flat surface extending without end in all directions; it has no length at all. Only the segment, bounded at both ends, has a measurable length.
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