Question

Question 1

Which of the following are models for perpendicular lines

(a) The adjacent edges of a tabletop.

(b) The lines of a railway track.

(c) The line segments forming the letter ‘L’.

(d) The letter V.

Answer 1

(a) The adjacent edges of a tabletop = Perpendicular

(b) The lines of a railway track = Not perpendicular as they are parallel.

(c) The line segments forming the letter ‘L’ = Perpendicular. The vertical line and horizontal line makes an angle of ${90}^{\circ }$.

(d) The letter V = Not perpendicular as the two lines form an acute angle.

Therefore, options (a) and (c) are models of perpendicular lines.