Page 304 - Math Smart - 7

In this chapter
CHAPTER 14.1
Pupils should be able to:
• use the notation and
labelling conventions Drawing and Measuring
for points, lines, angles
and shapes
Perpendicular and
• use a ruler, set square
and protractor to draw
perpendicular lines and
parallel lines
• use a ruler, set square Parallel Lines
and protractor to
measure and draw
straight lines to the
^ RECALL
nearest millilitre

O Look at the figure below and name the pairs of perpendicular and
parallel lines.

a) is perpendicular to
Why do swimmers compete
b) is perpendicular to
along parallel lines?
c) is parallel to I I
Hint: Measure the length
of the red and blue lines in
the diagram below.
Q Using a ruler, draw
a) a line that is 17 mm long,
b) a line that is 3 cm 5 mm long and
c) a line that is 29 mm long.

Construction in geometry means to draw lines, angles and shapes accurately. Here
are some ways and words that we will be using in a geometrical drawing.

A convention is a standard way of doing something.

Point . .. Angle Shape

A A B A
B
B

r
Points are labelled This is line D (
using a capital segment AB.
► Figure 14.1 Labelling letter. This is BAC, or This is quadrilateral
conventions for points, This is point A. ^BAC ABCD.
lines, angles and shapes

UNIT 14 I Geometrical Constructions