Page 306 - Math Smart - 7

Example 2

O Use a ruler and a set square to construct AB1 CD.

■D L

.D C- D C- i:
0 I) •D C-
6 B
Use the pencil and Mark point B on line Place the set square Label the new line Draw a square to
the ruler to draw segment CD. on line segment CD segment AB. show that AB 1 CD.
line segment CD. such that the right
angle of the set /LABC and /.ABD
are right angles.
square is at point 6.
Draw a line segment
from point B.

Q Use a ruler and a protractor to construct AB 1 CD.

' > '
\
A \
■D C- ■D C- ■D C- r ■D
I • r • • 14 B
i . I . I . I . I B
Use the pencil and Mark point B on line Place the protractor Use the pencil and Draw a square to
the ruler to draw segment CD. on line segment CD the ruler to draw a show that 1 CD.
line segment CD. such that the centre line segment from B /LABC and /-ABD
of the protractor is to the dot. are right angles.
at B. Label the new line
Make a dot at the segment y4fi.
90°-mark.
Drawing parallel lines

You have learnt about parallel lines in Stage 5. In this section, you will learn to
construct parallel lines using a ruler and a set square.

Example 3

Construct a line MN parallel to line PQ such that they are 3 cm apart.

P
Q
Solution
Place a set square on
line PQ and a ruler
at the shorter side of M- N
the set square.
3 cm

Add in the arrow heads to
Slide the set square show that line MN is parallel
3 cm along the ruler. to line PQ.
E UNIT 14 Geometrical Constructions