Which of the following is not a property of quadrilaterals?. . A.. There are four sides.. B.. There are four diagonals.. C.. There are four vertices.. D.. The measures of the interior angles add up to 360.

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Hagrid
The correct answer for this question is letter "(B) There are four diagonals." It is not a property of quadrilaterals. Among the properties of quadrilaterals include (1) There are four sides, (2) There are four vertices, (3) The measures of the interior angles add up to 360.