Transforming a picture
Task
Resize an inserted picture to a certain size and apply transformations to the picture in GeoGebra.
Explore the construction...
Instructions
Learn how to recreate the figure above.
1. | Make sure that you have the picture of the sunset saved on your computer before you start the actual construction. | |
2. | ![]() | Insert the picture of the sunset in the left part of the ![]() |
3. | ![]() | Move point A at the lower left corner of the picture and observe, how this affects the picture. |
4. | ![]() | Delete point B using the Delete tool. |
5. | ![]() | Create a new point B by entering B = A + (3, 0) into the Input Bar.
Hint: Don't forget to press Enter after your input.
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6. | ![]() | Set the new point B as the SECOND corner point of the picture to change its width to 3 cm. Hint: Open the Settings of the image and select tab Position. |
7. | ![]() | Create a vertical line through two points in the middle of the ![]() |
8. | ![]() | Mirror the picture at the line using the Reflect about Line tool by selecting the image and then the line. |
9. | ![]() | You might want to reduce the opacity of the image to be able to better distinguish it from the original (Settings of the image, tab Color). |
Try it yourself...
Instructions (continued)
10. | ![]() | Delete point B to restore the picture’s original size using the Delete tool. |
11. | ![]() | Create a new point B close to the lower right corner of the original picture. |
12. | ![]() | Set the new point B as the SECOND corner point of your picture. Hint: Open the Settings of the image and select tab Position. Note: You can now resize the image by moving point B. |
13. | ![]() | Create a new point E at the top left corner of the original picture. |
14. | ![]() | Set the new point E as the FOURTH corner point of your picture. Hint: Open the Settings of the image and select tab Position. |