L1.15 - Symmetry
Learning Intentions and Success Criteria
[color=#ff0000]We are learning to:[/color][br][list][*]Describe (orally and in writing) the reflections that take a figure onto itself.[/*][/list][color=#ff0000]We are successful when we can:[/color][br][list][*]Describe the reflections that take a figure onto itself.[/*][/list]
15.1: Back to the Start
Here is a segment AB.
[br]If you translate the segment up 5 units then down 5 units, it looks the same as it did originally.[br]
1. What other rigid transformations create an image that fits exactly over the original segment?
2. Are there any single rigid motions that do the same thing?
15.2: Self Reflection
Determine all the lines of symmetry for each shape in the applet and complete the following:[br][list][*]the name of the shape[br][/*][*]the definition of the shape[br][/*][*]drawings of each line of symmetry[br][/*][*]a description in words of each line of symmetry[br][/*][*]one non-example in a different color (a description and drawing of a reflection not over a line of symmetry)[br][/*][/list]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
15.3: Diabolic Diagonals
Kiran thinks both diagonals of a kite are lines of symmetry. Tyler thinks only 1 diagonal is a line of symmetry. Who is correct? Explain how you know (Look at the above applet for an example of a kite).
Sketch shapes in the applet and use ABC Text tool to write a transformation statement for each one.
Learning Intentions and Success Criteria
[color=#ff0000]We are learning to:[/color][br][list][*]Describe (orally and in writing) the reflections that take a figure onto itself.[/*][/list][color=#ff0000]We are successful when we can:[/color][br][list][*]Describe the reflections that take a figure onto itself.[/*][/list]
Cool-Down: Criss Cross
Use the applet below to answer the two questions.[br]1. What happens to the diagonal of a rectangle when the rectangle is reflected across a line of symmetry?[br]2. What does this suggest about the diagonals of rectangles?
Sketch a rectangle with a diagonal in the applet and reflect the rectangle across a line of symmetry.
