Transcript PERPENDICULAR AND PARALLEL LINES

PERPENDICULAR
AND
PARALLEL LINES
PARALLEL LINES
Parallel lines are lines that do
not intersect. No matter how
far you extend them, they will
never meet.
Lines are parallel if they are
the same distance apart.
PERPENDICULAR
LINES
A line is perpendicular to
another if it meets or
crosses it at right angles
(90°).
HOW TO DRAW
PERPENDICULAR
AND PARALLEL LINES
YOU NEED THESE TECHNICAL
DRAWING TOOLS:
Triangular
set square
There are two types of set squares and they are
named according to their angles.
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 is a scalene triangle.
Its shortest side is half of its
hypotenuse. The two sides
make a 90º angle, and the
hypotenuse makes a 60º
angle with one of the sides
and a 30º angle with the
other.
DRAWING
PARALLEL AND
PERPENDICULAR
LINES
Draw a straight line. Put the 45º triangular set
square on the line.
The 60º triangular set square should be
handled with care, press on it lightly when
drawing so it doesn’t move.
Then, you should move the 45º triangular set
square and make the parallel lines.
Turn the 45º triangular set square.
Don´t move the 60º triangular set square.
Draw the perpendicular lines by moving the
45º triangular set square.
As you can see, the vertical lines are perpendicular
to the horizontal ones.
ACTIVITY
Materials needed
•A pencil.
•Triangular set square
•Coloured pencils
First step:
Draw a horizontal line on your
worksheet. Then, draw parallel and
perpendicular lines with your
triangular set squares to make an
original composition.
Second step:
Draw an oblique line at 45º (look at
the example). Then, draw parallel
and perpendicular lines with your
triangular set squares.
Third step:
Using the lines, draw and color
different geometric shapes to make
an original composition.
Carpenter Center for Visual Arts, Cambridge, U.S.A.