Find the surface area of a cylinder: the circumference of the base is 25.12 cm, and the height is 8 cm.
求圆柱体的表面积：底面周长是25.12厘米，高是8厘米．
<gadget id="calculator">25.12 * 8</gadget>
<output>200.96</output>

<gadget id="calculator">25.12 / 3.14 / 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">200.96 + 100.48</gadget>
<output>301.44</output>

<result>301.44</result>