The answer to the question on Parallelograms being rectangles is that; No; the diagonals may not be congruent
<h3>How to Identify the properties of a Parallelogram?</h3>
1) We cannot conclude that the parallelogram is a rectangle but we can say that all rectangles are parallelograms.
2) The explanation for number 1 above is that the parallelogram's diagonals may not be equal or congruent but in rectangles diagonals are always equal and bisect each other.