Cut a cylinder from the middle to get a rectangular surface. The length of this rectangle is 16 cm and the width is 8 cm. What is the surface of this figure?
把一个圆柱从中间切开后得到一个长方形的面，这个长方形的长是16厘米，宽是8厘米，这个图形的表面是多少？
<gadget id="calculator">3.14 * 8 * 16</gadget>
<output>401.92</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<gadget id="calculator">401.92 + 100.48</gadget>
<output>502.4</output>

<result>502.4</result>