SYMMETRY LINE SYMMETRY A line symmetry occurs in

SYMMETRY

LINE SYMMETRY A line symmetry occurs in a shape if, when the shape is folded over the line the two pieces either side of the line, are exactly the same.

LINE SYMMETRY The Square 4 Lines of Symmetry

LINE SYMMETRY The Kite 1 Line of Symmetry

LINE SYMMETRY The Parallelogram 0 lines of symmetry!!!

How many lines of symmetry do these shapes have? 4 2 0 1

LINE SYMMETRY Let’s investigate letters of the alphabet for lines of symmetry. A B C D E FG H I J K L MNO PQR S T U V WX Y Z The letter O is special, try to find out how many lines of symmetry it has.

LINE SYMMETRY Example 1 : Complete the rest of the shape given the line of symmetry.

Example 2 : Complete the rest of the shape given the line of symmetry.

Example 3 : Complete the rest of the shape given the line of symmetry.

Example 4 : Complete the rest of the shape given the line of symmetry.

LINE SYMMETRY Now do Line Symmetry Exercise 1 & 2

Rotational Symmetry If, when you rotate a shape, it looks exactly the same as it did in its original position, then we say that the shape has rotational symmetry. A square • It looks exactly the same four times in a full turn. • It has rotational symmetry order 4.

Rotational Symmetry If, when you rotate a shape, it looks exactly the same as it did in its original position, then we say that the shape has rotational symmetry. T T • It looks exactly the same twice in a full turn. • It has got rotational symmetry order 2.

THESE SHAPES ALL HAVE TURN SYMMETRY. CAN YOU SAY WHAT ORDER? 2 * * 4 MARK THE CENTRE OF TURN SYMMETRY ON EACH * 6

Rotational Symmetry all around us Which road signs have got rotational symmetry? Click to see the answers.

Order 3 Order 2

Order 3 Order 2

Rotational Symmetry 1. Draw this shape into your jotter. 2. Use the tracing paper to make a copy of this shape. 3. Turn the tracing paper through 180 degrees about the dot. The new shape has HALF - TURN symmetry (order 2) The dot is called the centre of symmetry

Example 5 : Complete this shape so that it has half turn symmetry (order 2)

Example 5 : Complete this shape so that it has half turn symmetry (order 2)

Example 6 : Complete this shape so that it has half turn symmetry (order 4)

ROTATIONAL SYMMETRY Now do Rotational Symmetry Exercise 3& 4