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Learn how to create a parallel line 2cm above line RT, mark point A on RT, construct a perpendicular line through point A, set the width to 2cm, draw an arc to intersect the line, and construct another perpendicular line through point B.
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Construct a parallel line which is 2cm above line RT. 1. Mark a point A on RT. Construct a perpendicular line passes through A. B 2. Set the width to 2cm. Draw an arc to cut perpendicular line. 3. Construct a perpendicular line passes through B R A T