Transcript
Page 1: Introduction to Geometry

Form 1 MathematicsChapter 6

Page 2: Introduction to Geometry

Lesson requirement Textbook 1A Workbook 1A Notebook (and folder)

Before lessons start Desks in good order! No rubbish around!

Page 3: Introduction to Geometry

Geo- : land, earth (shape) -metry : metre (measure)

Basic concepts of Geometry Points 點 Lines 線 Planes 面 (Solids) 體

Page 4: Introduction to Geometry

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.

Page 5: Introduction to Geometry

A line can be drawn by points

What is the difference between Line and Line Segment ( 線段 )?

Line segment has end-points

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Naming a line: By 2 points on the line By a letter

Type of lines Straight line (直線 ) Curved line ( 曲線 )

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Naming a plane: By corners (vertex 頂點 ) in either

clockwise or anti-clockwise order

By a Capital letter

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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?

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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

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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

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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?

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SHW (I) Hand in correction today!

OBQ Correction! (except the Bonus

question) 18 Jan (Fri)

CBQ 18 Jan (Fri)

Page 13: Introduction to Geometry

Enjoy the world of Mathematics!

Ronald HUI


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