A. Diagonals are perpendicular
The fundamental properties of rectangles are:
A rectangle is a quadrilateral
- The opposite sides are parallel and equal to each other
- Each interior angle is equal to 90 degrees
- The sum of all the interior angles is equal to 360 degrees
- The diagonals bisect each other
- Both the diagonals have the same length
So the property which is not of the rectangle is that diagonals are perpendicular.
Because the diagonals of a rectangle are not perpendicular to each other.
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