Topicm99e364f0d597ed43_1528449000663_0Topic

Axially symmetrical figures

Levelm99e364f0d597ed43_1528449084556_0Level

Second

Core curriculumm99e364f0d597ed43_1528449076687_0Core curriculum

XV. Symmetries. The student:

3) Identifies axially symmetrical figures, marks their axes of symmetry and completes an axially symmetrical figureaxially symmetrical figureaxially symmetrical figure having the axis of symmetryaxis of symmetryaxis of symmetry and a part o fa given figure.

Timingm99e364f0d597ed43_1528449068082_0Timing

45 minutes

General objectivem99e364f0d597ed43_1528449523725_0General objective

Using simple, well known mathematical objects, interpreting mathematical concepts.

Specific objectivesm99e364f0d597ed43_1528449552113_0Specific objectives

1. Determining the properties of axially symmetrical figures.

2. Identifying the axis of symmetryaxis of symmetryaxis of symmetry.

3. Communicating in English, developing basic mathematical, computer and scientific competences, developing learning skills.

Learning outcomesm99e364f0d597ed43_1528450430307_0Learning outcomes

The student:

- determines the properties of axially symmetrical figures,

- identifies the axis of symmetryaxis of symmetryaxis of symmetry.

Methodsm99e364f0d597ed43_1528449534267_0Methods

1. Situational analysis.

2. Discussion.

Forms of workm99e364f0d597ed43_1528449514617_0Forms of work

1. Individual work.

2. Group work.

Lesson stages

Introductionm99e364f0d597ed43_1528450127855_0Introduction

The teacher introduces the subject of the lesson: the properties of axially symmetrical figures.

Task
Students recall what the axis of symmetryaxis of symmetryaxis of symmetry is and what its properties are. Then they draw any circle and mark some axes of its of symmetry.

Procedurem99e364f0d597ed43_1528446435040_0Procedure

Task
Students observe the drawing of the butterfly and notice that each point after being transformed in axial symmetryaxial symmetryaxial symmetry also belongs to the figure.

[Illustration 1]

The students and the teacher write down the definition of an axially symmetrical figureaxially symmetrical figureaxially symmetrical figure.

Definition of an axially symmetrical figure.
Figure G is axially symmetrical, if there is a line p and every point of the figure G after being transformed in symmetry with respect to axis p belongs to the figure G.m99e364f0d597ed43_1527752263647_0Figure G is axially symmetrical, if there is a line p and every point of the figure G after being transformed in symmetry with respect to axis p belongs to the figure G.

An axially symmetrical figure is its reflection is axial symmetry. Examples of axially symmetrical figures.m99e364f0d597ed43_1527752256679_0An axially symmetrical figure is its reflection is axial symmetry. Examples of axially symmetrical figures.

[Illustration 2]

Task
Students create axially symmetrical figures using their computers.

[Geogebra applet]

Task
Students select the letters of the Latin alphabet which are axially symmetrical. They point out letters that have more than one axis of symmetry.

[Illustration 3]

Task
Draw a figure that has at least one axis of symmetryaxis of symmetryaxis of symmetry and consists of three circles of the same radius.

Lesson summarym99e364f0d597ed43_1528450119332_0Lesson summary

Students do the revision exercises.

Then together they sum up the class, by formulating conclusions to memorise.

- Figure G is axially symmetrical, if there is a line p and every point of the figure G after being transformed in symmetry with respect to axis p belongs to the figure G.

- The figure is called the an axially symmetrical figure, if it exists stright line that the image of the figure in symmetry with the same straight line is the same figure.

Selected words and expressions used in the lesson plan

axial symmetryAxial symmetryaxial symmetry

axially symmetrical figureAxially symmetrical figureaxially symmetrical figure

axis of symmetryAxis of symmetryaxis of symmetry

image of the figureimage of a figureimage of the figure

transformation of a figureTransformation of a figuretransformation of a figure

m99e364f0d597ed43_1527752263647_0
m99e364f0d597ed43_1527752256679_0
m99e364f0d597ed43_1528449000663_0
m99e364f0d597ed43_1528449084556_0
m99e364f0d597ed43_1528449076687_0
m99e364f0d597ed43_1528449068082_0
m99e364f0d597ed43_1528449523725_0
m99e364f0d597ed43_1528449552113_0
m99e364f0d597ed43_1528450430307_0
m99e364f0d597ed43_1528449534267_0
m99e364f0d597ed43_1528449514617_0
m99e364f0d597ed43_1528450127855_0
m99e364f0d597ed43_1528446435040_0
m99e364f0d597ed43_1528450119332_0
axially symmetrical figure1
axially symmetrical figure

figura osiowosymetryczna

R6b20BMTSIRJo1
wymowa w języku angielskim: axially symmetrical figure
axis of symmetry1
axis of symmetry

oś symetrii

R1elwfDc8kz4a1
wymowa w języku angielskim: axis of symmetry
axial symmetry1
axial symmetry

symetria osiowa

R1Ck62u1mXr2u1
wymowa w języku angielskim: axial symmetry
image of a figure1
image of a figure

obraz figury

R119yRI6h7YEY
nagranie abstraktu
transformation of a figure1
transformation of a figure

przekształcenie figury

R1GCQCvEC5Iet1
wymowa w języku angielskim: transformation of a figure