### 3.1.8. Redefine

An object may be redefined using its Context menu. This is very useful for subsequent changes of your construction. You can also open the Redefine dialog by selecting Move and double clicking on a dependant object in the algebra window.

Examples:

In order to place a free point A on a line h, choose Redefine for point A and enter Point[h] in the input field of the appearing dialog. To remove the point from this line and make it free again, redefine it to some free coordinates.

Another example is the conversion of a line h through two points A and B into a segment. Choose Redefine and enter Segment[A, B] in the input field of the appearing dialog. This also works the other way round.

Redefining objects is a very versatile tool to change a construction. Please note that this may also change the order of the construction steps in the Construction protocol.

Related Topics

3.1. General Notes

www.geogebra.org