The semi-perimeter is half of the sum of the lengths of the sides of the triangle. In this case, the sides are a=11 yards, b=9 yards, and c=7 yards. So, the semi-perimeter is calculated as follows:
\[s = \frac{1}{2}(a+b+c) = \frac{1}{2}(11+9+7) = 13.5 \text{
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