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Scan the QR Code or visit https://youtu.be/ElKif-Hy2mA to watch the video
of the construction of a line segment. Then, explain the rationale of the
construction steps.

(ii) Perpendicular bisectors A

If line AB is perpendicular to line segment CD and C
divide CD into two parts of equal length, then line AB
is known as the perpendicular bisector of CD. D

B

3

Construct the perpendicular bisector of line segment PQ using only a pair of compasses
and a ruler.

P Q

3 2 CHAPTER

P Q 8

3 2

4

1 Adjust and set the 2 Construct two arcs 3 Without altering 4 Draw a line joining
compasses to a from P, one above the distance on the points of
distance slightly and one below PQ. the compasses, intersection of the
more than half the construct two arcs arcs constructed in
length of line PQ. from Q, one above Steps 2 and 3.
and one below PQ.

Scan the QR Code or visit https://youtu.be/P6M50r8Mblk to watch the video of
the construction of a perpendicular bisector. Then, explain the rationale of the
construction steps.

177
Lines and Angles

08 TB Math F1.indd 177 11/10/16 12:17 PM