To find the length of the third side of the triangle, we can use the law of cosines, which states that c^2 = a^2 + b^2 - 2ab cos(C), where c is the length of the third side, a and b are the lengths of the other two sides, and C is the angle between the two known sides. Substituting the given values, we get c^2 = 6^2 + 7^2 - 2(6)(7)cos(110). Using a calculator, we get c^2 ≈ 44.07. Taking the square root of both sides, we get c ≈ 6.64. Therefore, the length of the third side needs to be approximately 6.64 feet.