A cylinder is viewed from the front as a square with side length 20 cm, what is its surface area?
一个圆柱从正面看是一个边长20厘米的正方形，它的表面积是多少．
<gadget id="calculator">3.14 * 20 * 20</gadget>
<output>1_256</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">3.14 * 100 * 2</gadget>
<output>628</output>

<gadget id="calculator">1_256 + 628</gadget>
<output>1_884</output>

<result>1_884</result>