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Notice that the given figure is a 45^(∘)-45^(∘)-90^(∘) triangle.
19.5sqrt(2)
Consider the given right triangle.
In a 45^(∘)-45^(∘)-90^(∘) triangle, the legs are congruent and the hypotenuse is sqrt(2) times the length of a leg. With this information, we can find the value of x. x= sqrt(2) * 19.5 ⇔ x=19.5sqrt(2)