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Introduction to Geometry

Form 1 Mathematics Chapter 6. Introduction to Geometry. Reminder. Lesson requirement Textbook 1A Workbook 1A Notebook (and folder) Before lessons start Desks in good order! No rubbish around!. What is Geometry (p.225). Geo- : land, earth (shape) -metry : metre (measure)

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Introduction to Geometry

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  1. Form 1 Mathematics Chapter 6 Introduction to Geometry

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

  3. What is Geometry(p.225) • Geo- : land, earth (shape) • -metry : metre (measure) • Basic concepts of Geometry • Points 點 • Lines 線 • Planes 面 • (Solids) 體

  4. Points (p.226) • Points are the most basic concept in Geometry. • They are represented by a “X” and labelled by a Capital letter. • A point describes a location.

  5. Lines (p.226) • A line can be drawn by points • What is the difference between Line and Line Segment(線段)? • Line segment has end-points

  6. Lines • Naming a line: • By 2 points on the line • By a letter • Type of lines • Straight line (直線) • Curved line(曲線)

  7. Planes (p.227) • Naming a plane: • By corners (vertex 頂點) in either clockwise or anti-clockwise order • By a Capital letter

  8. Relationship among Points,Lines and Planes (p.228) • We can learn a lot about geometry from the art of origami (摺紙) • Let’s try to fold the paper: • Is the crease (摺痕) a point, a line or a plane?

  9. Relationship amongPoints, Lines and Planes • Consider ABD and BCD are two different planes. • When two planes intersect each other (相交), they form a line. • We called it line of intersection

  10. Relationship among Points, Lines and Planes • Let’s continue to fold the paper: • When two lines (AC and BD) intersect each other, they form a point. • We called it point of intersection

  11. Relationship among Points, Lines and Planes • Think about the followings: • Is it possible to have two planes that do not intersect each other? • Is it possible to have two lines that do not intersect each other?

  12. Reminder • SHW (I) • Hand in correction today! • OBQ • Correction! (except the Bonus question) • 18 Jan (Fri) • CBQ • 18 Jan (Fri)

  13. Enjoy the world of Mathematics! Ronald HUI

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