1. Symmetry and Order of Rotation Aim: To recognise symmetry and rotational symmetry. Look at the letter A, it has one line of symmetry. A Does the letter B have a line of symmetry? B Go through the alphabet and list those letters with a line of symmetry. Yes One side of the red line is exactly the same as the other side!

2. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

3. Order of Rotation A shape has an order of rotation if when rotated, it can fit exactly onto itself at least once before getting to its original place. Look at an equilateral triangle: Fits inside itself once Fits inside itself twice Last place is where it began. An equilateral triangle has an order of rotation 3.

4. Lets look at a few other shapes: AB CD The Square AB has order of rotation: 1234 4 The Rhombus CD has order of rotation: 12 2

5. Symmetry and Order of Rotation Aim: To recognise symmetry and rotational symmetry. A shape has a line of symmetry if both sides of the line are exactly the same. A shapes order of rotation is the number of times it can fit inside itself having completed a full turn. A shape has no order of rotation if it can not fit inside itself other than in its original place. FG

6. Look at these regular shapes: Plenary How many lines of symmetry does an equilateral triangle have? How many lines of symmetry does a regular pentagon have? What is the order of rotation? How many lines of symmetry does a square have? What is the order of rotation?

7. Plenary How many lines of symmetry does a regular octagon have? What is its order of rotation? How many lines of symmetry does a regular Pentagon have? What is its order of rotation? 8 5 8 5