A rhombus.
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Only if the parallelogram is in the form of a rhombus will its diagonals bisect each other at right angles
Suppose that the parallelogram is a rhombus (a parallelogram with equal sides). If we draw the diagonals, isosceles triangles are formed (where the median is also an angle bisector and perpendicular to the base). Since the diagonals of a parallelogram bisect each other, and the diagonals don't bisect the vertex angles where they are drawn, then the parallelogram is not a rhombus.
None but its diagonals are perpendicular lines intersecting each other at right angles.
The 2 diagonals of a rhombus intersect each other at right angles which is 90 degrees.
A parallelogram