Rotational Symmetry in Other Shapes
In this activity we are going to look at the rotational symmetry of other shapes.
Use the Polygon tool to create any shape and add a New Point as well. Select the Rotate Object around Point by angle tool, and click on the shape you just created, then the point. A dialogue box will appear, and in angle, press the symbols button on the right. Choose the top left symbol (alpha), and delete any other text already in there. Before pressing OK, select "Clockwise".
Choose select mode.
Grab the orange point to change the angle of rotation, and move the single point you added to move the centre.
Can you make a 5 sided shape with rotational symmetry order 2? What about other types of shapes?
Use the Polygon tool to create any shape and add a New Point as well. Select the Rotate Object around Point by angle tool, and click on the shape you just created, then the point. A dialogue box will appear, and in angle, press the symbols button on the right. Choose the top left symbol (alpha), and delete any other text already in there. Before pressing OK, select "Clockwise".
Choose select mode.
Grab the orange point to change the angle of rotation, and move the single point you added to move the centre.
Can you make a 5 sided shape with rotational symmetry order 2? What about other types of shapes?
Ideas for Teachers
This activity give the students a bit more freedom to explore other shapes and their symmetries. Make sure they all know how to use it by demonstrating on the board first what they need to do. Then they can be creative.
Asking them to create a 5 sided shape with order two rotational symmetry will get them thinking about what makes a shape have rotational symmetry.
This activity give the students a bit more freedom to explore other shapes and their symmetries. Make sure they all know how to use it by demonstrating on the board first what they need to do. Then they can be creative.
Asking them to create a 5 sided shape with order two rotational symmetry will get them thinking about what makes a shape have rotational symmetry.
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