T Madas A shape has rotational symmetry if
- Slides: 42
© T Madas
A shape has rotational symmetry, if it looks the same in more than one position, when rotated about its centre. We say it has a rotational symmetry of order 2 if it looks the same in 2 positions within a whole turn © T Madas
A shape has rotational symmetry, if it looks the same in more than one position, when rotated about its centre. We say it has a rotational symmetry of order 3 if it looks the same in 3 positions within a whole turn © T Madas
A shape has rotational symmetry, if it looks the same in more than one position, when rotated about its centre. We say it has a rotational symmetry of order 4 if it looks the same in 4 positions within a whole turn © T Madas
Rotational Symmetry Practice © T Madas
Find the order of rotational symmetry for each shape: 4 6 3 2 © T Madas
Find the order of rotational symmetry for each shape: 6 3 none © T Madas
Rotation and Rotational Symmetry © T Madas
We we start we the flag shape below We want to create a new shape with rotational symmetry We pick a point as the centre of rotation For rotational symmetry of order 2: We rotate the shape by 180° 360 ÷ 2 = 180 © T Madas
For rotational symmetry of order 4: We rotate the shape by 90° 360 ÷ 4 = 90 © T Madas
For rotational symmetry of order 3: We rotate the shape by 120° 360 ÷ 3 = 120 © T Madas
For rotational symmetry of order 5: We rotate the shape by 72° 360 ÷ 5 = 72 © T Madas
Rotational Symmetry Practice © T Madas
Shade one or more squares to create a shape with rotational order: 5 © T Madas
Shade one or more squares to create a shape with rotational order: 2 © T Madas
Rotational Symmetry Practice © T Madas
Make a shape with rotational symmetry of order 2 © T Madas
Make a shape with rotational symmetry of order 4 © T Madas
Make a shape with rotational symmetry of order 3 © T Madas
Rotational Symmetry Practice © T Madas
Shade this shape so that it has rotational symmetry of order 4 © T Madas
Shade this shape so that it has rotational symmetry of order 4 © T Madas
© T Madas
Complete each shape so it has rotational symmetry of order 2 about the given point. 1 4 2 3 5 6 © T Madas
Complete each shape so it has rotational symmetry of order 4 about the given point. 1 4 2 3 5 6 © T Madas
Shade some of the squares in the following two grids so that the resulting pattern has order of rotational symmetry of 4. © T Madas
© T Madas
Part of a shape is drawn on this grid. The shape has rotational symmetry of order 4, about the point P. Complete the shape. P © T Madas
© T Madas
a) b) Mark all the lines of symmetry on each shape. For the shapes that have rotational symmetry, write down its order. 1 3 2 4 © T Madas
a) b) Mark all the lines of symmetry on each shape. For the shapes that have rotational symmetry, write down its order. 1 3 2 4 © T Madas
a) b) Mark all the lines of symmetry on each shape. For the shapes that have rotational symmetry, write down its order. 1 2 Order 3 3 4 © T Madas
a) b) Mark all the lines of symmetry on each shape. For the shapes that have rotational symmetry, write down its order. 1 2 Order 3 3 4 © T Madas
a) b) Mark all the lines of symmetry on each shape. For the shapes that have rotational symmetry, write down its order. 1 2 Order 3 3 4 Order 1 © T Madas
a) b) Mark all the lines of symmetry on each shape. For the shapes that have rotational symmetry, write down its order. 1 2 Order 3 3 4 Order 1 © T Madas
© T Madas
1. 2. A D Look at the shapes labelled as A to F Write the letter of the shapes that have 2 lines of symmetry. Write the letter of the shapes that have rotational symmetry of order 2. B E C F © T Madas
1. 2. A D Look at the shapes labelled as A to F Write the letter of the shapes that have 2 lines of symmetry. Write the letter of the shapes that have rotational symmetry of order 2. B E C F © T Madas
© T Madas
Four road signs are shown below. 1. Write down the letter of the two signs that have one line of symmetry. 2. Write down the letter of the sign that has rotational symmetry and state the order of this symmetry. A B C D © T Madas
Four road signs are shown below. 1. Write down the letter of the two signs that have one line of symmetry. 2. Write down the letter of the sign that has rotational symmetry and state the order of this symmetry. A B C D Order 3 © T Madas
© T Madas
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- T
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