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griz said:
That's an Ellipse. For your situation get a piece of thin trim, stop, etc., spot some finish nails & bend until you get the result you are looking for.
I believe that is a segmented arch. Only one radius involved, as far as I can see. Nevertheless, bending trim piece works great.
 

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I use Google sketchup. Draw the arc you want with the right dimensions. Then measure the height from the basr every 3". Transfer that layout to your plywood and connect the dots. I just used that method on a 14' and a 19' eyebrow arch. Much smoother than freehanding or trying to guess at it. You do eyebrows and ellipses by stretching a circle.
The string method works, but not really well on larger arches past 6 feet or so, the string has too much stretch to be consistent in my experience.
 

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The 2 we are doing are 13" wide, they look very good that wide.
 
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