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SYMMETRY

• Line Symmetry is found when a figure can be divided by a line into two parts, each part being a mirror image of the other.

• Ex: making a snow flake with a folded piece of paper. The fold line is the “line of symmetry” for the shape that you cut out.

DESCRIBE ANY SYMMETRY YOU SEE IN THE FOLLOWING.

HOW MANY LINES OF SYMMETRY DO EACH OF THE FOLLOWING HAVE?

ROTATIONAL SYMMETRY

• Rotational Symmetry can be seen if a figure coincides with itself after rotating 180 degrees or less, either clockwise or counterclockwise, about a single point.

• Ex: A small plane’s propeller can have two or three arms. A ship’s propeller can have many more arms.

• Do you see any rotational symmetry in the room?

• Rotational symmetry has specific order, also called fold, which is the number of exact image matches when you complete an entire circle around one central point.

WHAT ORDER DO THE FOLLOWING HAVE?

HOW MANY FOLD SYMMETRY DOES EACH OF THE FOLLOWING HAVE?

PRACTICE!!