Answer
$9.7\, ft^2$
Work Step by Step
$s = \dfrac{1}{2}(a+b+c) = dfrac{1}{2}(8.32+6.23+3.45) = 9 \, ft$
$S = \sqrt{s(s-a)(s-b)(s-c)} = \sqrt{9 (9-8.32)(9-6.23)(9-3.45)}$
$S = 9.7\, ft^2$
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