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Circumcircle using geogebra:
1. You want a blank background. So, click on view > axes.
2. You want to click the icon [. A] to draw the points of a triangle. Put three points at random.
3. Then you need to bisect the angles. Click on the icon 4 places to the right. Click on the little red arrow button and make sure you choose 'Angle Bisector'. Click on the points: ABC, BCA, CAb to bisect the angles.
4. Click on the icon 6 places to the right. Select 'Circle through Three Points' and then click the points AB.
Here is what you should hopefully get:
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