Answer
d. $\sqrt{(7)(4)(2)(1)}$
Work Step by Step
$s = \dfrac{1}{2}(a+b+c) = \dfrac{1}{2} (3+5+6) = 7$
$(s-a) = 4$
$(s-b) = 2$
$(s-c) = 1$
$S = \sqrt{s(s-a)(s-b)(s-c)} = \sqrt{(7)(4)(2)(1)}$
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