The base area of a cylinder is 314cm**2, the height is 1.2dm, what is its side area in cm**2.
一个圆柱的底面积是314cm**2，高是1.2dm，它的侧面积是多少cm**2．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 20 * 1.2 * 10</gadget>
<output>753.6</output>

<result>753.6</result>