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the given figure is a rhombus, so it's area =

where, d1 and d2 are diagonals of the rhombus,

and since, the diagnonals of rhombus bisects each other, the values of their diagonals are

(2 × x) and (2 × 15) =》2x and 30 respectively,

so, by finding the area using the given diagonals and equating it with the real area, we get :

=》

=》

=》

=》

so,

value of x = 10 units