Draw a line $l$ . Draw a perpendicular to $l$ at any point on $l$ .On this perpendicular choose a point $X, 4 c m$ away from $l$ . Through $X$ ,draw a line $m$ parallel to $l$ .

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$F i r s t w e d r a w a l i n e l (a s s h o w n i n t h e f i g u r e) L e t " p " b e a n y o i n t o n l N e x t w e d r a w a l i n e M p p e r p e n d i c u l a r t o l (M p ⊥ l) w e p l o t t h e p o i n t " X " o n M p w h i c h i s 4 c m a w a y f r o m l . N o w w e d r a w a l i n e m p a s s i n g t h r o u g h t h e p o i n t " X " w h i c h i s p e r p e n d i c u l a r t o M p T h e l i n e m i s p a r a l l e l t o l (m ∥ l)$

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Draw a line $l$ . Draw a perpendicular to $l$ at any point on $l$ .On this perpendicular choose a point $X, 4 c m$ away from $l$ . Through $X$ ,draw a line $m$ parallel to $l$ .