Page 325 - Math Smart - 7
P. 325
Construction in geometry requires us to draw lines, angles and shapes accurately.
Useful tips for neat accurate geometrical constructions
Align the protractor baseline correctly.
so ^ 200
N ,V0 »» ,
Show all construction
lines clearly.
baseline centre baseline centre
Read all instruments from
Read instruments on the correct starting Hold all instruments firmly.
directly above.
scale and from the correct starting point.
outer scale
» M 100
oS> . \ \ \ 1 I / / / , ^
inner scale not ac accurate
To measure this angle, read from the Use a sharp pencil to draw light Draw single, smooth lines.
inner scale. construction lines.
V.
Remember to measure accurately
rd y
to 1 mm and 1°.
Notation and labelling conventions
Point Line Angle Shape Parallel lines i Perpendicular lines
point A line segment
AB
tL
ABC, or
^ABC quadrilateral AB H CD ASICD
ABCD
