Transcript PERPENDICULAR AND PARALLEL LINES

Technical
drawing tools
The ruler
The graduated ruler is
the most common tool
used for making straight
lines and to measure
distances.
It has a bevelled edge with
the measurements marked
in millimetres.
Triangular
set square
There are two types of
set squares
and they are named according
to the angles present on each.
45º Triangular set square
It’s an isosceles
triangle. Two sides
make a 90º angle
and its hypotenuse
forms a 45º angle
with each of the
other two sides.
60º Triangular set square
It’s is a scalene triangle.
The two sides make a
90º angle, the
hypotenuse makes a 60º
angle with one of the
sides and a 30º angle
with the other.
Mechanical
pencil
It is a plastic or metal tool that has an
inner tube that holds a graphite lead.
Mechanical pencils are designed to
provide lines of constant thickness
without requiring sharpening.
Stylograph
This is a tool we use for ink drawings.
The protractor
A protractor is used to transfer and measure
angles. The units of measurement utilized are
usually degrees.
The compass
This tool is used to make arched lines
and circles.
ACTIVITY
What is the function
of each of these tools?
Protractor
Set
square
Ruler
Mechanical
pencil
Compass
Stylograph
What is the function of each of these tools?
We use it for making
straight lines.
We use it to transfer
and measure angles
We use it to measure
distances.
We use it to draw parallel
and perpendicular lines
We use it to make lines of
constant thickness
We use it for ink
drawings
We use it to make
arched lines
What is the function
of each of these tools?
SOLUTION
What is the function of each
of these tools?
We use for making
straight lines.
Ruler
We use to measure
distances.
We use to transfer and
measure angles
We use to make lines of
constant thickness
Protractor
Mechanical
pencil
We use to draw parallel
and perpendicular lines
We use to make
arched lines
We use for ink
drawings
Set
square
Compass
Stylograph