![]() Next, we construct an angle slider that will rotate point B about A. To construct a circle with center A and radius 1, type circle, then press the ENTER key.ĥ,Next, to construct point B on (1,0).To do this, type B = (1,0) in the Input bar, then press the ENTER key.Ħ. This will produce point A on the origin.Ĥ. Select the Intersect Two Objects tool, click the x-axis and click the y-axis. ![]() To automatically label the new points and not label the other objects, from the menu bar, click Option>Labeling>New Points Only.ģ.First, we construct the center of the unit circle. Open GeoGebra and select Algebra & Graphics from the Perspectives menu.Ģ. You can view the output of this tutorial here.ġ. If you want to follow this tutorial step-by-step, you can open the GeoGebra window in your browser by clicking here. The path of this point is called the epicycloid. Along the rotating circle, we will also rotate a point on its circumference about its center (see red point in the diagram).
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