Question

when do we can say that a quadrilateral is a RHOMBUS.

Answer 1

when all the sides of a quadrilateral are equal then the quadrilateral can be called as a rhombus because all the sides of a rhombus are equal in length.

Answer 2

1) When all sides of a quadrilateral are equal.
2) When the diagonals bisect the angles and bisect each other at 90°.