A cylinder with a base circumference of 15.7 cm and a height of 22 cm is its lateral area in square centimetres.
底面周长是15.7cm的圆柱体，它的高是22cm，那么它的侧面积是多少平方厘米．
<gadget id="calculator">15.7 * 22</gadget>
<output>345.4</output>

<result>345.4</result>