Saturday, April 20, 2013

Symmetries

Line Symmetries:
A geometric figure has a line of symmetry if it is its own image under a reflection

Here are some things in real life that have line symmetry:

Rotational (Turn) Symmetries:
A.  A figure has rotational symmetry, or turn symmetry, when the traced figure can be rotated less than 360 degrees about some point so that it matches the original figure

B  When a figure will coincide with itself after a rotation a degree amount is stated.  Here is a video to further demonstrate rotational symmetry


Point Symmetry:
Any figure that has 180 degrees rotational symmetry is said to have point symmetry about the turn center.  Any figure with point symmetry is its own image under a half-turn


This website has a great line symmetry game for younger kids!
http://www.innovationslearning.co.uk/subjects/maths/activities/year3/symmetry/shape_game.asp

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