INTRODUCTION TO COORDINATES Form 1 Mathematics Chapter 8

Reminder Lesson requirement ◦ Textbook 1B ◦ Workbook 1B ◦ Notebook ◦ Folder Before lessons start ◦ Desks in good order! ◦ No rubbish around!

Rectangular coordinates What is ( x, y )?

Rectangular coordinates What are the coordinates of A, B and C?

Rectangular coordinates Quadrant ( 象限 )

Time for Practice Pages 40 – 42 of Textbook 1B ◦ Questions 2 – 10 Pages 14 – 15 of Workbook 1B ◦ Questions 2 – 7

Polar coordinates (p.58) Locate the position from a fixed point

Polar coordinates (p.58) Radar Heyuan ( 河源 ) is (3.3, 70  ) Macau ( 澳門 ) is (1.4, 190  ) Guangzhou ( 廣州 ) is (2.5, 130  )

Polar coordinates (p.58)

Time for Practice Pages 63 – 64 of Textbook 1B ◦ Questions 1 – 6 Pages 25 – 26 of Workbook 1B ◦ Questions 1 – 4

Distance (horizontal) A = (11,12) B = (22,12) Distance of AB = 22 – 11 = 11 Distance of (x 1,y 1 ) and (x 2,y 1 ) =x 2 – x 1 Same y 1 !

Distance (vertical) A = (11,12) X = (11,20) Distance of AX = 20 – 12 = 8 Distance of (x 1,y 1 ) and (x 1,y 2 ) =y 2 – y 1 Same x 1 !

Time for Practice Pages 47 – 48 of Textbook 1B ◦ Questions 1 – 13 Pages 17 – 18 of Workbook 1B ◦ Questions 1 – 4

Area of plane figures Different formula for areas

Area of parallelogram

Area of triangle

Area of trapezium

Calculating areas

Time for Practice Pages 55 – 57 of Textbook 1B ◦ Questions 1 – 17 Pages 21 – 23 of Workbook 1B ◦ Questions 1 – 7

Reminder Oral Re-Dictation ◦ 5 Feb (Tue) – 7 Feb (Thu) CBQ ◦ 6 Feb (Wed) SHW (I), SHW (IV) ◦ 27 Feb (Wed) SHW (II), SHW (III) ◦ 1 Mar (Fri)

Enjoy the world of Mathematics! Ronald HUI