First of all, a application of fixed circles.

 

Construct a triangle with side lengths 8, 6 and 5.

Use the fixed circle tool for this. Click on A and somewhere else. In the dialog, enter 5 for the size. Leave "fixed" checked. Otherwise you could draw the radius of the circle with the mouse.

The same at B with radius 6.

If you now create the intersection, the problem is solved and you get a feedback.

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