Reflecting Polygons Over the Axes

Author:
Abigail McCann, Ben Dougherty
Topic:
Polygons

Predict where the image points will be located when this polygon is reflected over each axis.

Imagine polygon ABCDE is reflected over the y axis:

Which coordinates in its points will be preserved and which will flip signs?

Select all that apply
  • A
  • B
  • C
Check my answer (3)

If polygon ABCDE is reflected over the y axis, what will be the coordinates for A'?

Select all that apply
  • A
  • B
  • C
Check my answer (3)

Imagine polygon ABCDE is reflected over the x axis:

Which coordinates in its points will be preserved and which will flip signs?

Select all that apply
  • A
  • B
  • C
Check my answer (3)

If ABCDE is reflected over the x axis, what will be the coordinates for B'?

Select all that apply
  • A
  • B
  • C
Check my answer (3)

Now try it out! Click the boxes to reflect the polygon over the x and y axes. Use the image that is produced to answer the questions.

Were the predictions you made in the section above right? Explain how you know:

Does reflection change the distance between the points in the image?

Select all that apply
  • A
  • B
Check my answer (3)

Does reflection change the size of the shape?

Select all that apply
  • A
  • B
Check my answer (3)

What are the coordinates of D' when polygon ABCDE is reflected over the x axis?

Select all that apply
  • A
  • B
  • C
Check my answer (3)

After ABCDE is reflected over the y axis, how does the distance from point B to the y axis compare to the distance from B' to the y axis.

Select all that apply
  • A
  • B
  • C
Check my answer (3)

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