Answer
$6$ square units
Work Step by Step
By Heron's formula, $K=\sqrt{s(s-a)(s-b)(s-c)}$, where $s=\frac{a+b+c}{2}.$
Hence,
$s=\frac{4+5+3}{2}=6$,
Thus,
$K=\sqrt{6(6-4)(6-5)(6-4)}=6.$
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