A cylinder has a base circumference of 31.4 cm and a height of 6 cm. What is its lateral area in square centimetres.
一个圆柱，底面周长是31.4厘米，高是6厘米．它的侧面积是多少平方厘米．
<gadget id="calculator">31.4 * 6</gadget>
<output>188.4</output>

<result>188.4</result>