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Give a definition for each of the following terms. Are there other terms that need to be defined first ? What are they, and how might you define them ?
Parallrel lines

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Solution
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Parallel Lines :
If end points of two straight lines do not meet even if they are produced on both sides, they are called parallel lines.
Before definition concept of point, straight line is necessary.
Point : A point is that which has no part. Straight line :
A stgraight line is a line which lies evenly with the points on itself.

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