The area of a triangle can be calculated from Heron's formula $A = \sqrt{S(S-a)(S-b)(S-c)}$, where $a,\;b,\;c$ are length of the sides and $S = \large\frac{a+b+c}{2}$. <br> Calculate the area of a triangle with side length $5, \;7$ and $10$. Leave your answer in simplest radical form.

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