Drawing an arc with imagej

Is there to a way to draw an arc (exactly a part of a circle) in image j and measure its length? I used the Bezier Curve tool but I cannot exactly make sure it is an arc. The image looks like below. I just want to draw an arc, find the radius of the circle that the arc belongs to. (The line here is almost straight but there’s a very slight curve to it). Any help is appreciated. Thank you.

Hi, you could fit a circle to your data. You can try this using ImageJ.JS by clicking the link and then the run button in the editor window:

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