1. Draw perpendicular lines

2. Can you find any perpendicular lines?B E C F D M N P Q

3. The intersection point ( ) is called ( ).
Line ( ) and ( ) intersects at right angles, so line ( ) and ( ) is ( ). We can say: line ( ) is perpendicular to ( ), write as: ( )⊥( ). Or ( ), write as:( ).
The intersection point ( ) is called
( ). A B E C F D M N P Q

4. To learn drawing 1. Drawing Tools: set square and pencil

5. To learn drawing 2. Key : pinpoint the right angle and right angle sides

6. Right angle
Right
angle
side
Right angle side
Right angle
Right
angle
side
Right angle side

7. Draw the perpendicular line CD to line AB, foot of perpendicular is O
AB⊥CD

8. . . Draw the perpendicular line EF to line AB through point O AB⊥EF E

9. . Draw the perpendicular line MN to line AB through point P AB⊥MN M P

10. Draw line segment AB perpendicular of two parallel lines
AB⊥a or AB⊥b

11. Perpendicular line segments are always the same length.
Draw line segment AB perpendicular of two parallel lines D C B A F E b a
AB⊥a , CD⊥a , EF⊥a
AB = CD = EF
Perpendicular line segments are always the same length.

12. Do Exercises

13. Thank you!

14. . E F . . O