cross them over.
i.e. draw a line matching together the opposite vertices so you get a cross in the middle.
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A quadrilateral has four vertices.
The midpoint of the hypotenuse equidistant from all the vertices
A quadrilateral need not have any vertical sides.
The midpoint of the hypotenuse equidistant from all the vertices
The midpoint of the hypotenuse equidistant from all the vertices