Which of the following are models for perpendicular lines :
(a) The adjacent edges of a table top.
(b) The lines of a railway track.
(c) The line segments forming the letter ‘L’.
(d) The letter V.

Explanation

To determine which of the given options are models for perpendicular lines, we need to understand what perpendicular lines are. Perpendicular lines are two lines that intersect at a right angle, which is 90 degrees.

Let's analyze each option step by step:

### Step 1: Analyze the adjacent edges of a table top
- When we look at a table, the adjacent edges (for example, the edge of the table and the edge of the table leg) meet at a corner.
- This corner forms a right angle (90 degrees).
- **Conclusion**: The adjacent edges of a table top are perpendicular lines.
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