I would call it a 25-gon since that communicates the relevant information effortlessly. However, you could also call it an icosipentagon.
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A polygon with 5 sides is called a pentagon.
It's quite acceptable to call it a 25-agon but what's more important is knowing how to work out its properties.
the 11th sides of polygon is called UNDECAGON....... the 12th sides is DODECAGON.....
It is known as a regular polygon that has equal sides of the same lengths.
The formula for the sum of the interior angles of a polygon is: 180 * (n - 2) where n is the number of sides of the polygon. So the sum of the angles of a polygon with 25 sides is 180 * 23 = 4,140.