The distinct lines in the exercise are either parallel or perpendicular.
- 19. a and d are parallel lines
- 20. a and d are perpendicular lines
- 21. a and d are parallel lines
- 22. a and d are perpendicular lines
- 23. a and d are parallel lines
- 24. a and d are parallel lines
In geometry, || means parallel lines, while [tex]\mathbf{\perp }[/tex] means perpendicular lines
From the complete question (see attachment), we have the following highlights
Question 19.
Lines (a) to (d) are parallel.
So, lines (a) and (d) are parallel lines
Question 20.
Lines (a) to (c) are parallel.
But line (c) is perpendicular to line (d)
So, lines (a) and (d) are perpendicular lines
Question 21.
Lines (a) and (b) are parallel.
Lines (b) and (c) are perpendicular; so, lines (a) and (c) are perpendicular lines
Lines (c) and (d) are perpendicular; so, lines (a) and (d) are parallel lines
Question 22.
Lines (a) and (b) are perpendicular.
Lines (b) to (d) are parallel; so, lines (a) and (d) are perpendicular lines
Question 23.
Lines (a) and (b) are parallel.
Lines (b) to (d) are perpendicular; so, lines (a) and (d) are parallel lines
Question 24.
Lines (a) and (b) are perpendicular.
Lines (b) and (c) are parallel; so, lines (a) and (c) are perpendicular lines
Lines (c) and (d) are perpendicular; so, lines (a) and (d) are parallel lines
Read more about parallel and perpendicular lines at:
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