All related to triangles Part 3

Geometry Level 3

\[ ( \sqrt{13} + \sqrt{61} + \sqrt{80} ) \\ \times \\ ( \sqrt{13} + \sqrt{61} - \sqrt{80} ) \\ \times \\ ( \sqrt{13} - \sqrt{61} + \sqrt{80} ) \\ \times \\ (- \sqrt{13} + \sqrt{61} + \sqrt{80} ) \\ \]

What is the square root of the value of the expression above?

See Part 1, and Part 2.

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