Question

what is the formulas of rhombus and its properties

Answer 1

Area of Rhombus=1/2*d1*d2
Perimeter=Sum of All sides
Properties:-
All sides are congruent by definition.

The diagonals bisect the angles.

The diagonals are perpendicular bisectors of each other

All the properties of a parallelogram apply (the ones that matter here are parallel sides, opposite angles are congruent, and consecutive angles are supplementary).

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Answer 2

A rhombus is a type of parallelogram, and what distinguishes its shape is that all four of its sides are congruent.

There are several formulas for the rhombus that have to do with its 

Sides.all 4 sides are congruentAngles.diagonals bisect vertex anglesDiagonals.diagonals are perpendicularArea 

A square is a rhombus and a rectangle. In other words, if each angle of a rhombus is 90°, then it's a square.