Polygons

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EVALUATIONS

HELP EXIT VOCABULARY WEBSITE

LEARNING OUTCOMES

LESSONPLAN

INSTRUCTIONALDESIGNER

CONTENT

SUMMARY

POLYGONS

LEARNING OUTCOMES

At the end of the lesson students are able to :

Identify the concepts of polygons. Recognize and name polygons. Determine the number of sides, vertices and diagonals of given polygons. Identify the concepts of symmetry. Determine and draw the lines (s) of symmetry of shapes. Complete shapes given part of the shapes and the lines of symmetry.

LESSON PLANDay : ThursdayDate : 27/ 3 / 2008Time : 9.00-10.20 am Form : 1 MotivasiNumber of students : 35 Topic : 10 Learning Areas : Polygons Subtopic : 10.1 Recognizing Polygons.

: 10.2 Symmetry.Learning Outcomes : At the end of the lesson, students should be able to:

1) Recognise and naming the polygons. 2) Determine the number of sides, vertices

and diagonals of given polygon. 3) Determine and draw the lines

(s) of symmet of shapes. 4) Complete shapes given part

of the shades and the lines of symmetry.

Prior knowledge : Students knows the existence of certain object that’s have the shaped same as polygons in their surroundings.

Scientific attitude : Being cooperative, thinking rationally and being confident and independent.

Noble value : - Appreciating the all objects which we uses it everyday.

- Being responsible about this object and it must uses in the right way.

KBKK : Predicting, classifying, observing and using image and object to learn.

BBM : Courseware of the real world of Polygons Form 1

Phase ContentTeacher activities

Students activities

Sources

Induction set (2 min)

10.1 Introduction of polygons

Teacher shows a video the real world of polygons.

Students are watching the video that played by teacher.

Sources :The video of objects in polygon. KBKK/ Noble Values Observing, Appreciating the contribution of polygons.

Step 1(25 min)

10.2 Introduction of concept of polygons.

1) Teacher use the computer software to explain to students how to recognize and naming the polygons. 2) Teacher use the concrete materials such asprotractors, rulers, grid papers, geo-boards and computer software to explore the concept of polygons.. 3) Teacher shows a picture basic of polygons.

1) Students take note about developments of polygons. 2) Students are divided in group and ask to discuss and describe thethe relationshipbetween the sides, diagonals andvertices of polygons.

SourcesPPT: -Introduction to recognize polygons, naming and properties of polygons.-A diagram of polygons.

KBKK/ Noble Values : - Having critical and analytical thinking, thinking rationally. - Appreciating the contribution of science and technology.

Step 2( 20

min)

10.3 Introduction

of concept of symmetry.

1) Teacher teach students the introduction of concept of symmetry by using power point

presentation.2) Then, teacher shows

a picture of

symmetry.3) Teacher describes

the characteristics

symmetry of polygons by

using power point

presentations.

1) Students explore

the characteristics

symmetry by using mirrors, pattern

blocks, folding

papers or making

inkblot designs.2) Students

explore the importance of symmetry in

everyday situations

(e.g. pattern on buildings

and tiles).

Sources1) PPT:- Introduction of symmetry of

shapes.- The diagram shapes

of symmetry2) Worksheet

(activity 1)KBKK/ Noble

Values- Observing, having critical and

analytical thinking and being cooperative. Closing

( 30 min)

Tutorial Teacher gives a tutorial for students.

Students answer thequizzes.

Sources1) PPT- Tutorial

INSTRUCTIONAL DESIGNER

NOOR FARALIZA JAMAKD20051021690 NORHAZWANI SELAMAT

D20051021711

NOOR AIDA ABDULLAHD20051021691

NOR MAISARAH WAHABD20051021699

Recognising polygons

Do you know

which of them are polygons

?

Click the next button to view the

explanation

A polygon is a two dimensional shape that is enclosed by straight lines on all its sides.

Based on the above diagrams,

Is a three dimensional shape.

Is a two dimensional shape but enclosed by a

curve.

Is not enclosed by its sides

, and are two dimensional shapes that are enclosed by straight lines on all its sides.

Therefore, , , and are polygons.

Properties of Polygons

Vertex

Diagonal

A

B

C

D

Side

A polygon is a plane shape whose side are formed from three or more straight lines.

The table lists all the polygons having up to 8 sides.

Polygons

no. of

sides

no.of

angels

no.of

vertices

no. of diagonals

TRIANGLE 3 3 3 0

QUADRILATERAL 4 4 4 2

PENTAGON 5 5 5 5

HEXAGON 6 6 6 9

HEPTAGON 7 7 7 14

OCTAGON 8 8 8 20

Click the name of each polygon in the table to see a diagram.

Number of vertices = number of sides

What you can see about the number of vertices and the

number of sides?

An object is said to have line (s) of the symmetry if one side of it overlaps exactly with the other.

This can be done by folding the object along a specific line.

line of symmetry

Determining and drawing the line (s) of symmetry

How many line(s) of symmetry can you draw?

CLICK the figure below to view the line(s) of symmetry

Sumber : www.webweaver.nu

One line of symmetry

Sumber : www.tucoo.com

One line of symmetry

Four lines of symmetry

Three lines of symmetry

Six lines of symmetry

Five lines of symmetry

Completing a symmetrical figure

CLICK the figure below to view the symmetrical figure

Make sure all the parts match each

other

EVALUATIONS

QUESTION 1

QUESTION 2

QUESTION 3QUESTION 4

QUESTION 5

QUESTION 1

The figure below show a type of polygons.

The polygon is

pentagonheptagon

hexagon

trapezoid

Which of the following figures is a Which of the following figures is a polygon?polygon?

QUESTION QUESTION 22

Choose the correct statement :Choose the correct statement :

Triangle has three sides and vertices

true false

The number of vertices is equal to the number of sides

true false


Which of the following has noWhich of the following has no

symmetrical axis?symmetrical axis?


Determine the number of lines of Determine the number of lines of symmetry for the given shape.symmetry for the given shape.

2

5

4

3


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SUMMARY

POLYGON

NAMING POLYGON RECOGNISE POLYGON

PROPERTIES OF POLYGON

According to number of side Example : triangle, quadrilateral, pentagon and etc.

Vertices – points where two side meet Diagonal – lines joining two non-adjacent vertices

The number of sides = the number of vertices

SYMMETRY

Determining and drawing the line of symmetry

Completing a symmetrical figure

Line of symmetry has parts the match each other perfectly.

To complete a shapes given part of shape and the line of symmetry.

Polygon- poligon

Side - sisi

Shape - bentuk

Hexagon – heksagon

Octagon – oktagon

Quadrilateral – sisi empat

Triangle – segi tiga

Diagonal – pepenjuru

Vertex – bucu

Fold – lipat

Mark – tanda

Line of symmetry – garis simetri

Symmetry - simetri

Visit the following websites to learn more about polygons:

http://www.mathleague.com/help/geometry/polygon.htm

www.math.com/school/subject3/lessons/S3U2L1GL.html www.mcwdn.org/Geometry/Polygons.html www.sparknotes.com/math/geometry1/polygons/section1.html

http://mathworld.wolfram.com/Polygon.html

http://standards.nctm.org/document/eexamples/chap4/4.2/part2.htm

http://www.mathleague.com/help/geometry/polygon.htm

http://www.math.com/school/subject3/lessons/S3U2L1GL.html

http://www.mcwdn.org/Geometry/Polygons.html

http://www.sparknotes.com/math/geometry1/polygons/section1.html

http://mathworld.wolfram.com/Polygon.html

http://standards.nctm.org/document/eexamples/chap4/4.2/part2.htm

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Polygons