Form 1 Mathematics Chapter 6.  Lesson requirement  Textbook 1A  Workbook 1A  Notebook (and folder)  Before lessons start  Desks in good order! 

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Presentation transcript:

Form 1 Mathematics Chapter 6

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

 Geo-: land, earth (shape)  -metry: metre (measure)  Basic concepts of Geometry  Points 點  Lines 線  Planes 面  (Solids) 體

 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.

 A line can be drawn by points  What is the difference between Line and Line Segment ( 線段 )?  Line segment has end-points

 Naming a line:  By 2 points on the line  By a letter  Type of lines  Straight line ( 直線 )  Curved line ( 曲線 )

 Naming a plane:  By corners (vertex 頂點 ) in either clockwise or anti-clockwise order  By a Capital letter

 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?

 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

 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

 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?

 SHW (I)  Hand in correction today!  OBQ  Correction! (except the Bonus question)  18 Jan (Fri)  CBQ  18 Jan (Fri)

Enjoy the world of Mathematics! Ronald HUI