I Give definitions
(1) parallel lines
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parallel lines are lines in a plane which do not meet; that is, two straight lines in a plane that do not intersect at any point are said to be parallel.
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i) Parallel line - Two lines are said to be parallel when (a) They never meet or never intersect each other even if they are extended to the infinity. ( b) they coplanar. (ii) Perpendicular lines - Two lines AB and CD lying the same plane are said to be perpendicular, if they form a right angle.
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