Circle segment
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The measurement of a segment of a circle is not

different from the measurement of a radius or diameter.

Click three times with the mouse on a radius, which is

then shown as a segment of a circle.


The radius and the angle are shown, and also the centre

of the circle.  You can drag both ends of the circular arc to

make fine adjustments. Doing this changes the radius

and the angle. The centre of the circle cannot be modified.