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By itself it is just a number and not a geometrical figure
On the reverse of the quarter eagle, the eagle is sitting on a bundle of arrows. To the left of the arrows there will be a "D" which means you have a 1911 D quarter eagle, the key date. If there is no letter "D" to the left of the arrows, you have just a 1911 quarter eagle (occasionally called a 1911-P because it was struck in Philadelphia, however it doesn't have a P mintmark).
if its a line it goes on forever so it has arrows on each end. For a segment you just make a dot, measure 46 millimeters and put another dot on that end. No arrows on a segment.
"Figure" can be a written symbol of a number or a diagram or a geometrical shape. It is also used as a word in place of "calculate".
There is no 3 dimensional figure with JUST 3 edges.