« Vrati se
Let the sides of two rectangles be \{a,b\} and \{c,d\}, respectively, with a < c \leq d < b and ab < cd. Prove that the first rectangle can be placed within the second one if and only if

\left(b^2 - a^2\right)^2 \leq \left(bc - ad \right)^2 + \left(bd - ac \right)^2.

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