The side area of a cylinder is 9.42cm**2, the bottom area is 3.14cm**2, what is its surface area?
一个圆柱的侧面积是9.42cm**2，底面积是3.14cm**2，它的表面积是多少．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">9.42 + 6.28</gadget>
<output>15.7</output>

<result>15.7</result>