To find area $ A $ use formula:
$$ A = 2 l w + 2 l h + 2 w h $$After substituting $ l = 17.2 $ , $ w = 3 $ and $ h = 5.5 $ we have:
$$ A = 2 \cdot 17.2 \cdot 3 + 2 \cdot 17.2 \cdot 5.5 + 2 \cdot 3 \cdot 5.5 $$$$ A = 103.2 + 189.2 + 33 $$$$ A = 325.4 $$