The diagonals of square and rectangle only are equal. Rest all the parallelograms like Rhombus etc. do not have diagonals equal in size.
Diagonals of Rectangle do not intersect in right angle hence it is not perpendicular to each other. Only in case of Square, diagonal intersects at right angle.
In rhombus, diagonals bisect the angles and are the perpendicular bisector of each other.
In rhombus, every side has equal length but it in kite only pair of adjacent sides are equal in length.
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