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Axially symmetrical figures

Source: licencja: CC 0.

Figury osiowosymetryczne

Learning objectives

  • You will learn the properties and examples of axially symmetrical figures.

  • You will learn to identify and construct axially symmetrical figures.

Learning effect

  • You identify and construct axially symmetrical figures.

Task 1
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nagranie abstraktu

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

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Source: GroMar, licencja: CC BY 3.0.
Task 2
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nagranie abstraktu

Use the internet resources and search for pictures of animals, plants, objects that are axially symmetrical.

Axially symmetrical figure
Definition: Axially symmetrical figure
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nagranie abstraktu

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.

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nagranie abstraktu

An axially symmetrical figureaxially symmetrical figureaxially symmetrical figure is its reflection is axial symmetryaxial symmetryaxial symmetry.

Examples of axially symmetrical figures.

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Source: GroMar, licencja: CC BY 3.0.
Task 3
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nagranie abstraktu

Creating an axially symmetrical figureaxially symmetrical figureaxially symmetrical figure.

Create an axially symmetrical figure using the computer.

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Geogebra aplet - figury osiowosymetryczne. Galeria z opisami alternatywnymi poniżej.
Source: GroMar, licencja: CC BY 3.0.
Task 4
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nagranie abstraktu

Select the letters of the Latin alphabet which are axially symmetrical. Point out letters that have more than one axis of symmetryaxis of symmetryaxis of symmetry.

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Source: GroMar, licencja: CC BY 3.0.
Task 5
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nagranie abstraktu

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

Remember:

  • 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.

Exercises

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Exercise 1
Wersja alternatywna ćwiczenia: Determine which sentences are true. Figures that have more than one axis of symmetry are Możliwe odpowiedzi: 1. line segment, 2. isosceles triangle, 3. rectangle, 4. line
Exercise 2

Draw a rhombus whose side equals 5 cm and a line p which contains the longer diagonal of the rhombus. Complete the drawing so that you have a figure whose axis of symmetry is line p.

Exercise 3

Draw any axially symmetrical figure that consists of circles, triangles, squares and line segments. 
Describe the figure in English.

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Exercise 4
Wersja alternatywna ćwiczenia: Match English terms with their Polish equivalents. axial symmetry Możliwe odpowiedzi: 1. obraz figury, 2. figura osiowosymetryczna, 3. symetria osiowa, 4. oś symetrii axis of symmetry Możliwe odpowiedzi: 1. obraz figury, 2. figura osiowosymetryczna, 3. symetria osiowa, 4. oś symetrii image of a figure Możliwe odpowiedzi: 1. obraz figury, 2. figura osiowosymetryczna, 3. symetria osiowa, 4. oś symetrii axially symmetrical figure Możliwe odpowiedzi: 1. obraz figury, 2. figura osiowosymetryczna, 3. symetria osiowa, 4. oś symetrii
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Interaktywna gra, polegająca na łączeniu wyrazów w pary w ciągu jednej minuty. Czas zaczyna upływać wraz z rozpoczęciem gry. Jeden ruch to odkrywanie najpierw jednej potem drugiej karty z wyrazem. Każdy wyraz jest odczytywany. Kolejny ruch to odkrywanie trzeciej i czwartej karty. W ten sposób odsłuchasz wszystkie wyrazy. Nawigacja z poziomu klawiatury za pomocą strzałek, odsłuchiwanie wyrazów enterem lub spacją. Znajdź wszystkie pary wyrazów.
Source: Zespół autorski Politechniki Łódzkiej, licencja: CC BY 3.0.

Glossary

axial symmetry
axial symmetry

symetria osiowa

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wymowa w języku angielskim: axial symmetry
axially symmetrical figure
axially symmetrical figure

figura osiowosymetryczna

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

oś symetrii

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wymowa w języku angielskim: axis of symmetry
image of a figure
image of a figure

obraz figury

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nagranie abstraktu
transformation of a figure
transformation of a figure

przekształcenie figury

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wymowa w języku angielskim: transformation of a figure

Keywords

axial symmetryaxial symmetryaxial symmetry – jest to symetria względem prostej

axially symmetrical figureaxially symmetrical figureaxially symmetrical figure – jest swoim obrazem w symetrii osiowej

axis of symmetryaxis of symmetryaxis of symmetry

image of a figureimage of a figureimage of a figure

transformation of a figuretransformation of a figuretransformation of a figure