In this activity you will to learn how to resize an inserted picture to a certain size and how to apply transformations to the picture in GeoGebra.

Learn how to recreate the figure above.[br][br][table] [tr] [td]1.[/td] [td][br][br][/td] [td]Make sure that you have the [url=http://static.geogebra.org/book/intro-en/worksheets/Sunset_Palmtrees.jpg]picture of the sunset[/url] saved on your computer before you start the actual construction.[/td][/tr][tr] [td]2.[/td] [td][icon]/images/ggb/toolbar/mode_image.png[/icon][/td] [td]Insert the picture of the sunset in the left part of the [img]https://wiki.geogebra.org/uploads/thumb/c/c8/Menu_view_graphics.svg/16px-Menu_view_graphics.svg.png[/img] [i]Graphics View[/i].[br][u]Note[/u]: The first corner point [i]A[/i] and the second corner point [i]B[/i] of the image are created automatically.[/td][/tr] [tr] [td]3.[/td] [td][icon]/images/ggb/toolbar/mode_move.png[/icon][br][/td] [td]Move point [i]A[/i] at the lower left corner of the picture and observe, how this affects the picture.[br][/td][/tr] [tr] [td]4.[/td][td][icon]/images/ggb/toolbar/mode_delete.png[/icon][br][/td] [td]Delete point [i]B[/i] using the [i]Delete [/i]tool.[/td][/tr] [tr] [td]5.[/td] [td][icon]https://wiki.geogebra.org/uploads/thumb/4/40/Menu_view_algebra.svg/120px-Menu_view_algebra.svg.png[/icon][/td] [td]Create a new point [i]B[/i] by entering [code]B = A + (3, 0)[/code] into the [i]Algebra Input[/i].[br][u]Hint[/u]: Don't forget to press [i]Enter [/i]after your input. .[br][/td][/tr] [tr] [td]6.[/td] [td][icon]https://wiki.geogebra.org/uploads/thumb/3/30/Menu-options.svg/120px-Menu-options.svg.png[/icon][/td] [td]Set the new point [i]B[/i] as the SECOND corner point of the picture in order to change its width to 3 cm.[br][u]Hint[/u]: Open the [i]Properties[/i] dialog of the image and select tab [i]Position[/i].[/td][/tr] [tr] [td]7.[/td] [td][icon]/images/ggb/toolbar/mode_join.png[/icon][/td] [td]Create a vertical line through two points in the middle of the [img]https://wiki.geogebra.org/uploads/thumb/c/c8/Menu_view_graphics.svg/16px-Menu_view_graphics.svg.png[/img] [i]Graphics View [/i]using the [i]Line [/i]tool.[/td][/tr] [tr] [td]8.[/td] [td][icon]/images/ggb/toolbar/mode_mirroratline.png[/icon][/td] [td]Mirror the picture at the line using tool [i]Reflect about Line[/i].[br][/td][/tr][tr] [td]9.[/td] [td][icon]https://wiki.geogebra.org/uploads/thumb/3/30/Menu-options.svg/120px-Menu-options.svg.png[/icon][br][/td] [td]You might want to reduce the opacity of the image in order to be able to better distinguish it from the original ([i]Properties dialog[/i] of the image, tab [i]Color[/i]).[/td][/tr][/table]

[table] [tr] [td]10.[/td] [td][icon]https://tube.geogebra.org/images/ggb/toolbar/mode_delete.png[/icon][/td] [td]Delete point [i]B[/i] to restore the picture’s original size using the [i]Delete [/i]tool.[/td][/tr] [tr] [td]11.[/td] [td][icon]https://tube.geogebra.org/images/ggb/toolbar/mode_point.png[/icon][br][/td] [td]Create a new point [i]B[/i] close to the lower right corner of the original picture.[br][/td][/tr] [tr] [td]12.[/td] [td][icon]https://wiki.geogebra.org/uploads/thumb/3/30/Menu-options.svg/120px-Menu-options.svg.png[/icon][br][/td] [td]Set the new point [i]B[/i] as the SECOND corner point of your picture.[br][u]Hint[/u]: You can now resize the image by moving point [i]B[/i].[br][/td][/tr] [tr] [td]13.[/td] [td][icon]https://tube.geogebra.org/images/ggb/toolbar/mode_point.png[/icon][/td] [td]Create a new point [i]E[/i] at the upper left corner of the original picture.[br][/td][/tr] [tr] [td]14.[/td] [td][icon]https://wiki.geogebra.org/uploads/thumb/3/30/Menu-options.svg/120px-Menu-options.svg.png[/icon][br][/td] [td]Set the new point [i]E[/i] as the FOURTH corner point of your picture.[/td][/tr][/table][br][u]Note[/u]: You are now able to observe how changes to the original picture affect the reflected picture. On the next worksheet you will learn how to further enhance this construction.