5. used to draw
circles, arcs,
radii, and parts
of many symbols
used for dividing
distances into a
number of equal
parts by the
trial-and-error
method.
used for measuring and
setting angles other
than those obtainable
with the triangles.
COMPASS DIVIDER
PROTRACTOR
6. TRIANGLES
T-SQUARE RULER
used for drawing vertical
and oblique lines. The 45°
and the 30° x 60° are the
most commonly used.
used as a guide in
drawing horizontal lines
and in measuring up to
48” straight lines.
is usually 6 or 12 inches in
length. It is needed for
measuring sizes and
distances.
7. TRIANGULAR
SCALE
TAPE RULER
a concave, spring-steel
blade ranging from 1/4"
to 1" wide and 6 to
about 300 feet in
length, coiled inside a
carrying case
main purpose is to
reproduce the dimension
in full size or to reduce
or enlarge them on a
drawing
