In

**GeoGebra**, an object may be free, semi-free, or dependent. It is important to understand the differences among the three to perform effective geometric constructions.
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**free objec**t does not depend on any object. You can move a free object anywhere on the Graphics view. In the figure above, points*O*and*C*are free objects. Point*O*determines the center of the circle which can be placed anywhere, and point*C*determines its radius.
A

**semi-free**object, on the other hand, depends on one object. Semi-free objects can be moved but with restrictions. In the applet above, point*A*is a semi-free object. It can move, but only along the circumference of the circle.
Lastly, a

**dependent objec**t depends on two or more objects. Unlike the other types of objects mentioned above, it cannot be moved by the mouse. For instance, point B above depends on point A and point C. Since it is the midpoint of points A and C, it will only move if point A or point C are moved.
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