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Only rectangles (squares included) have congruent diagonals, because all their angles are congruent (90 degrees). If you have angles larger or smaller than 90 degrees it makes the diagonals different lengths.

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Q: Which parallelograms have congruent diagonals?
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Related questions

Do parallelograms have congruent diagonals?

Some of them (rectangles) do.


Which property is not true for all parallelograms?

Diagonals are congruent


What is the counterexample of all parallelograms have congruent diagonals?

Tiiangle


Do all parallelograms have diagonals which bisect?

Yes; all parallelograms have diagonals that bisect each other. Other properties of parallelograms are: * The opposite sides are congruent. * The opposite sides are parallel. * The opposite angles are congruent.


What are all quadrilaterals with congruent diagonals?

Parallelograms or isosceles trapezium.


Can the diagonals of two different parallelograms be congruent?

They could be congruent, but not necessarily. It cannot be assumed that they are.


What are 4 different types of quadrilateralas?

There are: Squares, which have all four sides parallel and congruent, all four angles are right and congruent, the diagonals bisect each other and are congruent. Trapezoids, which have two of their sides parallel Rhombus, which have all sides congruent, diagonals bisect, and opposite angles are congruent Parallelograms, which have opposite sides congruent and parallel, diagonals bisect Rectangle, which is a square but one pair of opposite sides aren't congruent.


Do kites have congruent diagonals?

No, kites do not have congruent diagonals.


Are diagonals in a trapezoid congruent?

are the diagonals in a trapezoid congruent


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No. No. No. No.


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The diagonals are perpendicular, but not necessarily congruent.


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If one angle is right, then all angles are right. The diagonals of a parallelogram bisect each other. Opposite angles are congruent. Opposite sides are congruent. Consecutive angles are supplementary.