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That will depend on how many sides the polygon has.
You can find several of them in any polygon.
For a polygon with an even number of verticesjoin each vertex to the opposite vertex. Test for symmetry.join the mid-point of each side to the mid-point of the opposite side. Test for symmetry.For a polygon with an odd number of verticesjoin each vertex to the mid-point of the opposite side. Test for symmetry.
Always.
As it wouldn't be a triangle. If you forced this, you would then have formed an irregular polygon square missing a side.