What is the lateral area of a cylinder with a base circumference of 31.4 cm and a height of 10 cm?
一个底面周长是31.4厘米，高是10厘米的圆柱体，侧面积是多少平方厘米．
<gadget id="calculator">31.4 * 10</gadget>
<output>314</output>

<result>314</result>