1. Introduction to Geometry
Form 1 Mathematics
Chapter 6
Introduction to Geometry

2. Reminder Lesson requirement Before lessons start Textbook 1A
Workbook 1A
Notebook (and folder)
Before lessons start
Desks in good order!
No rubbish around!

3. Result of Close Book Quiz
Full mark: 40 and 10 bonus
Highest: 39
Lowest: 12
Average: 24.8
Number of students between : 6
Major Problems
Careless mistakes
Cannot write in English sentences!

4. Result of Close Book Quiz
8th place: LI Kwok Hin Gordon
6th place: CHEN Yi, David
CHOI King Shing, Walker
5th place: CHAN Wa Pan, Ben
4th place: FU Ling Yin, Larry
3rd place: LI Sai Kong
2nd place: WU SHAN Hao Yi
1st place: LI Ming Chun, Edward
Congratulations!!!!!! Well done!!!!!!

5. Revision on Geometry Basic concepts of Geometry
Points 點
Lines 線
Planes 面
(Solids) 體
Other concepts of Geometry
Angles 角
Parallel Lines 平行線
Perpendicular Lines 垂直線

6. Naming
Points 點
Lines 線
Planes 面

7. Angles
Angles:
Name of angles (middle letter is vertex!)

8. Types of Angles (p.229)
There are six types:

9. Types of Angles (p.229)
Note: Any two line segments that meet each other form two angles.
We name x as “DAC”, and we name y as “the reflex angle DAC”.

10. Parallel lines (p.231)
When two lines in the same plane, but they do not intersect each other, they are called parallel lines (平行線)
A pair of parallel lines is denoted by a pair of arrows (箭號)
We write “AB // CD”

11. Perpendicular lines (p.232)
When two lines in the same plane are intersecting at right angle (90), they are called perpendicular lines (垂直線)
A right angle will be clearly shown in a pair of perpendicular lines
We write “AB  CD”

12. Time for Practice Pages 233 – 234 of Textbook 1A
Questions 1 – 9
Pages 107 – 110 of Workbook 1A
Questions 1 – 8

13. Reminder CBQ SHW (I) – Chapter 6 Correction! (ALL questions)
23 Jan (Wed)
SHW (I) – Chapter 6

14. Enjoy the world of Mathematics!
Ronald HUI