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Another Community answer which is hopelessly wrong!
A decagon has 10 sides. A polygon with 4 fewer sides would have 6 sides and so it is a hexagon.
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A decagon is a polygon with 10 sides. In a decagon, each interior angle measures 144 degrees. An acute angle is an angle that measures less than 90 degrees. Since all the interior angles of a decagon are 144 degrees, there are no acute angles in a decagon.
A quadrilateral has 4 sides anda hexagon has 6 sides. So the polygon between them is the one that has 5 sides. That is the pentagon.
A quadrilateral, pentagon or hexagon.
If those are exterior angles, the exterior angles of any polygon add up to 360. That would be 20 sides.
That's true of every rhombus with less than 4 right angles.Also, every polygon with more than four sides can have 4 equal ones,but doesn't need to.