Square, Rhombus.
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Or a kite or arrowhead.
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Not necessarily. But a parallelogram with perpendicular diagonals must always be one.
No. It is false. If both of those conditions are met, then the quadrilateral is a square.
No. The diagonals of a rhombus are perpendicular only if the rhombus is a square.
No. The diagonals are perpendicular, but they dont have to be congruent.
4 corners so 2 diagonals.