To do this, we can use the Law of Cosines, which states that $c^2 = a^2 + b^2 - 2ab \cos(C)$.
Plugging in the given values, we have $c^2 = (35.1 \mathrm{ft})^2 + (43.8 \mathrm{ft})^2 - 2(35.1 \mathrm{ft})(43.8 \mathrm{ft}) \cos(72.2^{\circ})$.
Simplifying this
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