LINES AND ANGLES - NCERT

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and RS in Fig. 6.5 (i) are intersecting lines and in Fig. 6.5 (ii) are parallel lines. Note that the lengths of the common perpendiculars at different points on these parallel lines is the same. This equal length is called the distance between two parallel lines. 6.4 Pairs of Angles In Section 6.2, you have learnt the definitions of

  Glean, Line, Points, Parallel, Parallel lines