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
No comments:
Post a Comment