Which of the following is true of the constructions of an equilateral triangle, a square, and a regular hexagon when they are inscribed in circles?

A diameter through the center of a circle can divide each inscribed regular polygon into two matching halves. For an equilateral triangle, it passes through a vertex and the midpoint of the opposite side; for a square and a regular hexagon, it can pass through opposite vertices. The other statements are not true for all three shapes: they do not each need three diameters, and their side lengths are not all equal to the circle’s diameter.

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