In any parallelogram, opposite sides are equal and opposite angles are equal. A rhombus is a special type of parallelogram where all sides are equal in length. Thus, if ABCD is given to be both a parallelogram and a rhombus, we can infer that all sides are equal.
Let’s denote the sides of the rhombus as AB = BC = CD = DA. If we have additional information about the lengths or angles in the figure, we can set up an equation to solve for x. Typically, x might represent the length of a side or one of the angles.
For a rhombus, the diagonals bisect each other at right angles. If x is related to the lengths of the diagonals, we can also use properties of right triangles formed by these diagonals.
In conclusion, without specific values or relationships regarding x, we cannot determine the exact value. However, we can assert that if ABCD is a rhombus, all sides must be equal, and any calculations involving x must reflect this equality.