2. Parallel, Intersecting and
Perpendicular lines
• Line CD is parallel to line AB.
A B
C D
• Lines that never cross are called parallel lines.
3. Parallel, Intersecting and
Perpendicular lines
• Line EF intersects line AB at point K.
F
A B
K
E
• Intersecting lines are two or more lines that meet
at a common point.
4. Parallel, Intersecting and
Perpendicular lines
• Line GH is perpendicular to line AB.
G
A B
E
• Perpendicular lines are lines that intersect each
other at right angles.
5. Lets see if you can tell the difference
between parallel, intersecting and
perpendicular….
Parallel
6. Lets see if you can tell the difference
between parallel, intersecting and
perpendicular….
intersecting
7. Lets see if you can tell the difference
between parallel, intersecting and
perpendicular….
Perpendicular
8. How about this one
Parallel, Intersecting and
Perpendicular
9. So how do we draw perpendicular
lines?
• Method 1
• Place a set square on line AB with the right angle touching the
line.
A B
10. So how do we draw perpendicular
lines?
• Then draw along the side of the set square that is at right
angles to line AB.
A B
11. Drawing perpendicular lines
• Use your set square to draw lines that are
perpendicular to the following lines:
• 1.
12. Drawing perpendicular lines
• Use your set square to draw lines that are
perpendicular to the following lines:
• 2.
13. Drawing perpendicular lines
• Use your set square to draw lines that are
perpendicular to the following lines:
• 3.
14. Drawing perpendicular lines
• Use your set square to draw lines that are
perpendicular to the following lines:
• 4.
15. What if you don’t have a set square?
• Method 2: Draw a dot (X) on the middle of
line AB.
• Place the center of the protractor on the dot
A B
X
16. What if you don’t have a set square?
• Now draw another dot (Y) at the 90° mark on
the protractor.
Y
A B
X
17. What if you don’t have a set square?
• Draw a line to connect X and Y. Line XY is
Perpendicular to line AB.
Y
A B
X
