A cylindrical wooden barrel without a lid is 62.8 cm high, and its sides are exactly square. What is the surface area (outer surface) of this wooden barrel?
一个无盖的圆柱形木桶，高62.8厘米，将它的侧面展开正好是正方形，这个木桶的表面积(外表面)有多大？
<gadget id="calculator">62.8 * 62.8</gadget>
<output>3_943.84</output>

<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">3_943.84 + 314</gadget>
<output>4_257.84</output>

<result>4_257.84</result>