Symmetry.

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Presentation transcript:

Symmetry

We find it in architecture… …on a large scale…

…and on an every day scale

We find it in nature…

We find it in ancient things…

We find it in art…

We find it in optical illusions… Symmetry is all around us

Based on all the pictures you just saw…. Try to define symmetry in your own words before clicking to the next slide.

So…how can we define symmetry? If an object is balanced and can fit into itself by reflection, rotation or translation – it has symmetry An object can have line symmetry, or rotational symmetry Symmetry is related to motion geometry in that the object can be “moved”

Line symmetry Line symmetry occurs where an object can be divided into mirror images. This line is sometimes called a line of reflection or an axis of symmetry The line can be vertical, horizontal or oblique (slanted) An object can have one or more lines of symmetry – or none.

Examples of line symmetry

More examples of line symmetry E U

Rotation symmetry

Rotation symmetry

Based on the three pictures you just saw… Try to define rotational symmetry in your own words before clicking to the next slide.

Rotational symmetry… When an object or shape can be spun around its center of rotation, AND fit into its original outline more than once in a complete turn. This design fits into itself 10 times

Makes sure you have your notes to show me tomorrow!