1. 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.
(a) The adjacent edges of a table top are models for perpendicular lines.
(b) The lines of a railway track are not models for perpendicular lines as they are parallel to each other.
(c) The line segments forming the letter ‘L’ are models for perpendicular lines.
(d) The line segments forming the letter ‘V’ are models for perpendicular lines.