If you want to find similar triangles, use only SSS, SAS and AAA. Don't make an ASS of yourself.

\(ABCD\) is a square with \(AB=13\). Points \(E\) and \(F\) are exterior to \(ABCD\) such that \(BE=DF=5\) and \(AE=CF=12\).

If the length of \(EF\) can be represented as \(a\sqrt b \) where \(a\) and \(b\) are positive integers and \(b\) is not divisible by the square of any prime, then find \(ab\).

The area of the largest square which can be inscribed in a triangle with side lengths \(3, 4, 5\) is \(\dfrac{a}{b}\).

Find \(a+b\), where \(a\) and \(b\) are coprime, positive integers.

Find the area of the blue region (in \( \text{cm} ^2 \)). Give your answer to 1 decimal place.

If triangle \(ABC\) is similar to triangle \(BFA,\) then find \(\dfrac{AB}{BC}.\)

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