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(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.

Answer :

(a) and (c) are models for perpendicular lines.

- Q.2 Let \(\overline {PQ} \)be the perpendicular to the line segment\(\overline {XY} \). Let\(\overline {PQ} \)and \(\overline {XY} \) intersect at in the point A. What is the measure of \(\angle \)PAY?
- Q.3 There are two set squares in your box. What are the measures of the angles that are formed at their corners? Do they have any angle measure that is common?
- Q.4 Study the diagram. The line l is perpendicular to line m (a) Is CE = EG? (b) Does PE bisect CG? (c) Identify any two line segments for which PE is the perpendicular bisector. (d) Are these true? (i) AC > FG (ii) CD = GH (iii) BC < EH.

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