Rhombus

Definition
A plane convex quadrilateral is a rhombus if, and only if, all the four sides are congruent. [br]
Rhombus
Property of Rhombus
In every rhombus, all diagonals are perpendicular.
Argument
Exercise
Proof the argument of following property: "Every parallelogram that has perpendicular diagonals is a rhombus."
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Information: Rhombus