Performing Transformations Graphically vs. Algebraically

Anthony Dove shared this problem 5 years ago
Not a Problem

I have a problem that I hope can be fixed regarding transformations. When I do a reflection or rotation of an object graphically, Geogebra creates two new vertices for the image. I've attached an image to show what I mean. I follow the typical instructions for a graphic command. For example to create the 90-degree rotation about the origin in the image, I clicked and dragged to highlight quadrilateral ABCD, then I clicked on the origin, and then I entered 90 degrees counterclockwise. I would expect this to produce A', B', C', and D'. I do not want A_1', B_1', C_1', and D_1' to be created at the same time as it is redundant. Normally I just delete the second set of points, but I am tired of doing that and telling my students to do that as well. I know there are multiple methods for doing this in the Algebraic view, but when teaching K-12 students, using the graphic commands is more intuitive and efficient. Hopefully this minor glitch can be fixed. Thanks!

Comments (1)

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When you rotate a segment, then are also rotate the points of this segment.

If you rotate the segments and their points, then you have the points double (logically).

For alternatives in the context of polygons see here.

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