The value of x in the figure ABCD is 10.
What is a rhombus?
We know that rhombuses are a particular type of quadrilateral in Euclidean geometry. It is a unique instance of a parallelogram in which the diagonals meet at a 90-degree angle and all sides are equal.
How to solve it?
Since the side lengths of a rhombus are equal, so the lengths of AB and DC are equal.
Now, 3x - 11 = x + 9
i.e. 3x - x = 9 + 11
i.e. 2x = 20
i.e. x = 10
Therefore the value of x in the figure ABCD is 10.
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