1. Angles and Parallel Lines
Sec One Express Mathematics ICT Lesson
Chapter 7:
Angles and Parallel Lines
7.4 Perpendicular Bisector and Angle Bisector
Perpendicular Bisectors in nature.

2. Perpendicular Bisector
Sec One Express Mathematics ICT Lesson
Perpendicular Bisector
Lines that intersect at an angle of 90 degrees are _________________.
perpendicular lines
In the figure below, lines are perpendicular. A D C B

3. Sec One Express Mathematics ICT Lesson
Definition of
Perpendicular
Lines
Perpendicular lines are lines that intersect to form a
right angle. m n

4. Sec One Express Mathematics ICT Lesson
Definition of
Perpendicular
Bisectors
Definition
Perpendicular bisector is a line which cuts another line segment into two equal parts at 90 degree.
In the below image, AB is the perpendicular bisector of the line segment PQ and F is the midpoint of the line segment PQ.

5. Perpendicular in nature.
Sec One Express Mathematics ICT Lesson
Perpendicular in nature.
Question:
Can you spot the three perpendicular bisector?

6. Video Now, watch the video on how to construct perpendicular bisector.
Sec One Express Mathematics ICT Lesson
Video
Now, watch the video on how to construct perpendicular bisector.

7. Ace-learning Activity I
Sec One Express Mathematics ICT Lesson
Ace-learning Activity I
Now, log on to Ace-Learning and follow the instructions given in your inbox.
Focus on the part on perpendicular bisector.

8. Sec One Express Mathematics ICT Lesson
Worksheet
Please approach your teacher for hands-on practice on perpendicular bisector.

9. Sec One Express Mathematics ICT Lesson
Angle Bisector
Angle Bisector is a line that cuts an angle into two equal halves.
The line JK is an angle bisector of the angle LJM

10. Video Now, watch the video on how to construct angle bisector.
Sec One Express Mathematics ICT Lesson
Video
Now, watch the video on how to construct angle bisector.

11. Ace-learning Activity II
Sec One Express Mathematics ICT Lesson
Ace-learning Activity II
Now, log on to Ace-Learning and follow the instructions given in your inbox.
Focus on the part on angle bisector.

12. Sec One Express Mathematics ICT Lesson
Worksheet
Please approach your teacher for hands-on practice on angle bisector

13. Sec One Express Mathematics ICT Lesson
WHAT HAVE YOU LEARNT?