Which of the following has definite length?
a line
a ray
a line segment
none of these
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A line and a ray extend indefinitely, so their lengths cannot be measured. A line segment has two fixed end points and therefore a definite, measurable length.
Hence, option 3 is the correct option.
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Which of the following has no end points?
The number of points required to name a line is
1
2
3
4
The number of lines that can be drawn through a given point is
infinitely many