Because x+y creates 1 part 2 of a diagonal line of the square so \(x+y=\sqrt{\dfrac{4}{2}}=\sqrt{2}\)

So x+y=\(\sqrt{z}\Rightarrow\sqrt{2}=\sqrt{z}\Rightarrow z=2\)

Answer:The value of z is:2

Chúng ta có: x + y =\(\sqrt{\dfrac{4}{2}}=\sqrt{2}\) because x+y creates 1 part 2 of a diagonal line

So x+y=\(\sqrt{z}\Rightarrow\sqrt{2}=\sqrt{z}\)\(\Rightarrow z=2\)

Answer:z=2