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Week 9: Symmetry (Rotational (When an object is rotated in a certain…
Week 9: Symmetry
Rotational
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In art and design, rotational symmetry can be used to portray motion or speed.
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Classroom : Experimenting with different shapes to see which shapes can rotate (using angles of 90, 180, 270 and 360) onto itself in less than a full turn. Arrow - yes. trapezoid - no
Classroom activities
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Mira mirrors - help sts see lines of symmetry and reflections - drawing one wing on a butterfly and using the Mira to draw the reflection on the other wing.
Translate points on a grid by moving dots from one point to another - sts write coordinates of the dots, then translate them according to directions e.g. translate right 4 and down 2, and write the new coordinates.
BIG IDEAS
- Making shapes with symmetry - hands-on creation of their own examples of symmetrical shapes
- Folding shapes to test for symmetry - hands-on activity to explore the role of folding in showing that a shape is symmetrical
- Symmetry in the natural world - observe world around them
- Shapes that turn - beginning experiences with the idea of rotational symmetry
Reflectional
Also known as bilateral symmetry. It is the “mirror” effect, or when one object is reflected across a plane to create another instance of itself.
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Most common we see in nature, is horizontal reflection (a butterfly, the human body), with the central axis being vertical.
Can take on any direction: vertical, diagonal, and anything in between
Translational
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Example below, moved one object several times at even intervals. These intervals do not have to be equal in order to maintain translational symmetry; they just need to be proportional.
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Asymmetry
Is the lack of symmetry. Can also represent an object that breaks a predefined pattern of symmetry, or an imbalance of design elements.
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