Reflection Symmetry in Other Shapes
In this activity we are going to look at the reflection symmetry of other shapes.
Use the Polygon tool to create any shape. Select the Reflect Object in Line tool, and click on the shape you just created, then the line. This will produce the reflection of the object in the line.
Use the Pen tool to draw the lines of symmetry on the shape.
Grab the orange points and move the line to the mirror lines that you drew.
If the image fits perfectly over the shape, then you have found a mirror line.
Reset the activity, and start over again with a new shape.
Can you make a 5 sided shape with two lines of symmetry? What about other shapes with a given number of lines of symmetry?
Use the Polygon tool to create any shape. Select the Reflect Object in Line tool, and click on the shape you just created, then the line. This will produce the reflection of the object in the line.
Use the Pen tool to draw the lines of symmetry on the shape.
Grab the orange points and move the line to the mirror lines that you drew.
If the image fits perfectly over the shape, then you have found a mirror line.
Reset the activity, and start over again with a new shape.
Can you make a 5 sided shape with two lines of symmetry? What about other shapes with a given number of lines of symmetry?
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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 7 sided shape with one line of symmetry, or a 5 sided shape with two lines of symmetry will get them thinking about what makes a shape have line 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 7 sided shape with one line of symmetry, or a 5 sided shape with two lines of symmetry will get them thinking about what makes a shape have line symmetry.
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