Question

if all sides of a quadrilateral are equal but its diagonal are not equal , then is the quadrilateral necessarily Rhombus?

Answer 1

yes, because rhombus is the online quadrilateral whose diagonals are not equal but all sides are equal
parallelogram is the only quadrilateral other than rhombus whose diagonals are different

Answer 2

Yes because rhombus is such a quadrilateral whose diagonal are not equal