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Constructions
  
 
Problems
Problem 4.1: Line AB is perpendicular to line CD. Line EF is perpendicular to line CD. What is the angle formed between line AB and line EF? [Solution]
Problem 4.2: When perpendicular lines intersect, how many pairs of supplementary angles are formed? [Solution]
Problem 4.3: What is the shortest distance between two parallel lines? [Solution]
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